EU STEAM CD KEY: Requires an EUROPEAN IP address or you must activate it with a VPN (Virtual Private Network) in order to play Undertale. Might have languages restrictions or language packs. Read the description on the store game page to know if the EU IP is only needed for activation or for playing also (maybe on EU Servers).
- Welcome to UNDERTALE. In this RPG, you control a human who falls underground into the world of monsters. Now you must find your way out. Or stay trapped forever. ((Healthy Dog's Warning: Game contains imagery that may be harmful to players with photosensitive epilepsy or similar condition.)) features.
- 97% of the 2,621 user reviews on Steam in the last 30 days are positive. UNDERTALE is provided via Steam for Windows, Mac, and Linux and is also provided DRM-Free for Windows and Linux. A free Steam account is required.
- Our free Steam Wallet codes generator acts as a digital database and repository that offers Steam codes as free giveaways to the lucky users of our site. We offer these free codes whenever they are available, and you don't have to play games or answer surveys to receive them! Whenever our site administrator adds these free Steam Wallet codes.
- GIVEAWAY: UNDERTALE Steam key! October 25th, and I'l choose the winner at random and PM them the code. Best of luck, all! Stay determined!
This is a sub-page of Undertale.
To do:
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A debug mode can be activated by using a hex editor, like HxD. Change 00725B24 (in version 1.0), 00725D8C (in version 1.001) or 00725DDC (in version 1.001 Linux) to 01 in data.win (Windows versions) game.unx (Linux) or game.ios (Mac OS X). As of 8/21/17, UNDERTALE updated to version 1.08, (1.06 for Non-Steam applications.). To activate Debug Mode, find 007748C4, change to 01. This works for both versions.The easier way to enable/disable Debug Mode is to download a program called 'Undertale Mod Tool' and run the script called EnableDebug.
data.win can be extracted from UNDERTALE.exe by any decent archiving tool like 7-Zip or WinRAR. It's actually a self-extracting .cab containing all the game's resources along with the real executable, which can be run normally from wherever you extract the files to. game.ios Hello neighbor roadblocks. can be found in the OS X version by browsing into the Undertale application using 'Show Package Contents'.
(Note: If you are playing the Steam version, you should extract every file except steam_api.dll, or the debug mode won't be activated.)
- 2Keyboard Shortcuts
- 4Area Specific
- 5Fight Specific
Fun Events
When debug mode is enabled, all Gaster follower encounters will be triggered.
Keyboard Shortcuts
| Key | Effect |
|---|---|
| G | Opens dimensional box. |
| G (in shop) | Sets gold to 5000. |
| O | Opens a normally unused dialog to take items out of a dimensional box. |
| I | Same as above, but to put away. |
| S | Opens the save dialog. |
| L | Instantly loads your save file. |
| M | Increase murder level by 1. |
| F | Sets game speed to double normal speed, and FPS to 60, for the duration of a room. Does not affect sound. |
| P | Toggle room speed between fast and normal. |
| R | When pressed seven times in quick succession, restarts the game. |
| U | Toggles Undyne phone calls. Turns the player blue if enabled, yellow if disabled. |
| V | Shows room collision boxes. |
| W | Slows game down to 10 FPS. |
| 5 | Increase battle group by 5. Does not roll over to 0 after 256. |
| Backspace | Increases walk speed when held down. |
| Pg Up | Increase 'steps' by 100. |
| Pg Down | Sets attack in the STAT menu to 989. Appears to be cosmetic only. |
| End | Plays the next monster (Flowey if in a genocide run) dialogue from New Home. |
| Home | Starts a battle with the current battle group. Default is 140 (So Sorry) in version 1.0 and 80 (Mettaton) in version 1.001. In later updates the battle group default is 57. Set 009F553C (in version 1.0), 009EB414 (in version 1.001), 009EB918 (in version 1.001 Linux) or 00BD8200 (in version 1.06) in data.win, game.unx or game.ios to change. List of battle groups here. If the battle group is invalid, the last dialogue script is shown in the battle box under the YOU WON! text. The battle ends if you spare, flee, try to use an item, or act. The game crashes if you try to fight.(NOTE:To put the number you want you will need to convert the number you want to hex.) |
| Insert | Teleport to the next room in the room list. Places you in a specific position. |
| Del | Teleport to the previous room. |
| F3 | Places a file system_information_962 in your save folder. After game restart, puts you at the black screen after a genocide run. |
| F7 | Adds 500 gold. |
| F9 | Stops all sounds and music currently playing. |
| F10 | Toggle collision with walls. |
| F11 | Teleport to the room after Papyrus's boss fight (room_water1/idː82). |
| F12 | Restart room. |
| R + 6 | Teleport to Ruins tile puzzle room (room_ruins2/id:7). |
| T + 6 | Teleport to outside of Ruins exit (room_tundra1/id:44). |
| W + 6 | Same as F11. |
| F + 6 | Teleport to Hotlands water cooler room (room_fire2/id:138). |
| E + 6 | Teleport to New Home entrance (room_castle_front/id:219). |
| Y + 6 | Teleport to True Lab entrance (room_truelab_elevator/id:244). |
Battle Shortcuts
| Key | Effect |
|---|---|
| 1 | Halves game speed. Cannot go below 1 FPS, or game crashes. |
| 2 | Doubles game speed. Cannot go past 2x normal game speed. Crashes game if pressed too many times. |
| 8 | Shortens current enemy turn. |
| 9 | Extends current enemy turn. |
| F | Sets game speed to double normal speed. |
| W | Slows game down to 10 FPS. |
| Delete | Sets HP to 999 for current fight. |
| F6 | Sets mercy to 0 and attack to 9999. |
| O + P | Sets mercy to 9999, enabling the spare option instantly. Some enemies that cannot be normally spared turn into Aaron. |
Debug Flags
| To do: Which dialogue? |
| Flag | Line in savefile | Description |
|---|---|---|
| 4 | 5 | If set to 1, before Undyne's fight, her monologue will act as if you've killed no monsters, even if you've killed some. |
| 26 | 57 | Overrides murder level when set to a non-zero value. |
| 28 | 59 | If set to 1, holding C in dialogues will skip through them quickly. |
| 69 | 100 | If set to 1, changes Burgerpants' dialogue slightly. |
Area Specific
First Sans Encounter
Press J to zoom in on Sans, make a rimshot sound, and crash the game.
Alternate Reflection
The reflections of yourself in the puddles in Waterfall are replaced with a sprite of an unknown character when Space is pressed. According to the game files, the character seems to be Chara, but they also look like Kris from Deltarune.
Monster Kid Climb
Two numbers will appear over the player's head, starting at -1 and 0. The first number indicates the value an alarm is at (which alarm is determined by the second number), while the second number changes the first one and indicates Monster Kid's state.
Fight Specific
Lesser Dog
| Key | Effect |
|---|---|
| J | Increases head height. |
Undertale Steam Code
Papyrus
| Key | Effect |
|---|---|
| Spacebar | Sets Papyrus's next attack and dialogue to 'THE KING WILL TRIM A HEDGE IN THE SHAPE OF MY SMILE!!!' |
| O | If pressed when you are blue, Papyrus will not attack you, and will say '..' if you try to spare or attack him. |
Shyren
| Key | Effect |
|---|---|
| 3 | Increases the emotion variable, used during the fight to affect her status. |
Mad Dummy
A red number starting from 300 appears attached to the right of the Mad Dummy, indicating its health. Pressing A will set the number to 180, make the dummy float around, and make his next attack his 'FINAL ATTACK!' Stream my direct tv.
Undyne
Note: Undyne cannot be spared with the key combination O+P.
| Key | Effect |
|---|---|
| 7 | Sets HP to 999. |
| A | Decreases turn counter by 1. |
Asgore
A turn counter counts up from 0 in the top left corner of the screen. The higher the counter is, the harder Asgore's attacks are and the less defense Asgore has. Press A to decrease, press S to increase. If above 20, it is set back to 20 each time Asgore does his orange-blue attack. If set manually to above 22 or below 1, crashes the game when Asgore attacks.
Flowey
The text 'debug' in yellow comes down on the right side of the screen alongside Flowey. The intro and game over screens are skipped after the first death.
| Key | Effect |
|---|---|
| F3 | Creates system_information_962 in the save folder. |
| Home | Attack Flowey instantly. Does 6000 damage if all soul indicators are darkened. |
| Pg Up | Darkens the soul indicators in order, increasing damage and affecting the next soul battle. Disables darkening when all are darkened, and the next time a soul battle occurs, the game will crash. |
| Right Shift, Left Shift, X | Darkens the soul indicators in order, increasing damage and affecting the next soul battle. |
| Q | Starts the battle instantly during the intro. Does not stop the intro, so you cannot move and the attacks miss you until Flowey is closer. |
| W | Slows game down to 10 FPS. If used in Flowey's death state, starts the attack after Flowey's health is restored. |
| E | One burst of three stars from each eye. |
| R | One burst of seven stars from each eye. |
| I | Makes Flowey laugh and restart his attacks, including in a soul battle. |
| O | Purple Soul fight (books) |
| P | Green Soul fight (frying pan) |
| A | Toggle flamethrower |
| S | Saves battle state. Shows 'FILE 2 SAVED' at bottom left corner. |
| F | Doubles game speed. Lock on pellet attack. |
| G | Orange Soul fight (glove) |
| H | One hand-gun attack |
| J | Yellow Soul fight (gun) |
| K | Aqua Soul fight (knives) |
| L | Loads battle state. Shows 'FILE 2 LOADED' at bottom left corner. If there is no save, crashes game. |
| C | Toggles Flowey's mouth flap waving around. |
| V | Single vine attack. |
| N | Single F-Bomb. |
| M | Ball of teeth/dentata attack. |
| Shift | Deactivates souls one at a time. |
Asriel
| Key | Effect |
|---|---|
| C | Toggles Asriel's floating around and staying still above the middle of the screen. |
| Space | Same as above, but closer to the top. Asriel must be still for any of the below keys to work. Attacks stack and start instantly. |
| G | Chaos Buster/Chaos Blaster |
| B | Shocker Breaker/Shocker Breaker II |
| W | Chaos Saber/Chaos Slicer, slows the game down to 10 FPS |
| S | Star Blazing/Galacta Blazing |
| H | H Y P E R G O N E R |
Undyne the Undying
Note: Undyne cannot be spared with the key combination O+P.
| Key | Effect |
|---|---|
| 7 | Sets HP to 999. |
| A | Decreases turn counter by 1. |
Sans
| Key | Effect |
|---|---|
| E | Sets Sans' next attack to his special attack. |
| Q | Sets Sans' next attack to the part where he spares you. |
Free Undertale Steam Code
Note: This procedure involves editing a game file; create a backup copy of the file before proceeding. Use a hex editor to edit the 'data.win' file in the ame directory. Go to offset '000725B24' and change the '00' to '01' in the fourth row of that offset's line. While playing the game, enter one of the following codes to activate the corresponding cheat function:
| Result | Cheat Code |
| +100 Step | [Page Up] |
| Set attacks to 999 | [Page Down] |
| Increase battle group | 5 |
| Next room | [Insert] |
| Previous room | [Deleted] |
| Save | S |
| Load | L |
| Select saved game file | 0, 1, 2, 3, or 4 |
| Travel to room_fire2 (138) | F + 6 |
| Travel to room_water1 (82) | W + 6 |
| Travel to room_tundra1 (44) | T + 6 |
| Travel to room_castle_front (219) | E + 6 |
| Travel to room_ruins2 (7) | R + 6 |
| Travel to room_truelab_elevator (244) | Y + 6 |
| Spawn box (while in game) | G |
| +5,000 gold (while in a shop) | G |
| Take out panel | O |
| Put away panel | I |
| Increase murder level | M |
| Toggle room speeds | P |
| Set room speed to fast | F |
| Enable Undyne calls | U |
| Create file system_information_962 | [F3] |
| +500 gold | [F7] |
| Stop sound | [F9] |
| Pass through walls | [F10] |
| Travel to room_water1 (82) | [F11] |
| Restart room | [F12] |
| Show collision boxes | V |
| Fast walk speed | [Backspace] |
| Play current 'monster tale' determined by storyline | [End] |
| Battle current group (default is 140) | [Home] |
| Set HP to 999 (while in battle) | [Delete] |
| Slow down (while in battle) | 1 |
| Decrease speed (while in battle) | 2 |
| Decrease turn timer (while in battle) | 8 |
| Increase turn timer (while in battle) | 9 |
| Set mercy to 0 and attack to 999 (while in battle) | [F6] |
| Set mercy to 9,999 (while in battle) | O + P |
Note: This procedure involves editing a game file; create a backup copy of the file before proceeding. Use a text editor to edit the 'undertale.ini' file. Find the 'fun' variable, then change its name to Fun (case-sensitive) and change its value to anything else. You will now find new locations and NPCs related to a new character named 'W.D. Gaster'.
Hard modeEnter 'Frisk' as your name. If done correctly, you will get a warning that this will make your life hell. In Hard mode, you cannot retreat on the first turn of battles, will face tougher and new enemies, and can only hold three pieces of candy.
Developers' room
data.win can be extracted from UNDERTALE.exe by any decent archiving tool like 7-Zip or WinRAR. It's actually a self-extracting .cab containing all the game's resources along with the real executable, which can be run normally from wherever you extract the files to. game.ios Hello neighbor roadblocks. can be found in the OS X version by browsing into the Undertale application using 'Show Package Contents'.
(Note: If you are playing the Steam version, you should extract every file except steam_api.dll, or the debug mode won't be activated.)
- 2Keyboard Shortcuts
- 4Area Specific
- 5Fight Specific
Fun Events
When debug mode is enabled, all Gaster follower encounters will be triggered.
Keyboard Shortcuts
| Key | Effect |
|---|---|
| G | Opens dimensional box. |
| G (in shop) | Sets gold to 5000. |
| O | Opens a normally unused dialog to take items out of a dimensional box. |
| I | Same as above, but to put away. |
| S | Opens the save dialog. |
| L | Instantly loads your save file. |
| M | Increase murder level by 1. |
| F | Sets game speed to double normal speed, and FPS to 60, for the duration of a room. Does not affect sound. |
| P | Toggle room speed between fast and normal. |
| R | When pressed seven times in quick succession, restarts the game. |
| U | Toggles Undyne phone calls. Turns the player blue if enabled, yellow if disabled. |
| V | Shows room collision boxes. |
| W | Slows game down to 10 FPS. |
| 5 | Increase battle group by 5. Does not roll over to 0 after 256. |
| Backspace | Increases walk speed when held down. |
| Pg Up | Increase 'steps' by 100. |
| Pg Down | Sets attack in the STAT menu to 989. Appears to be cosmetic only. |
| End | Plays the next monster (Flowey if in a genocide run) dialogue from New Home. |
| Home | Starts a battle with the current battle group. Default is 140 (So Sorry) in version 1.0 and 80 (Mettaton) in version 1.001. In later updates the battle group default is 57. Set 009F553C (in version 1.0), 009EB414 (in version 1.001), 009EB918 (in version 1.001 Linux) or 00BD8200 (in version 1.06) in data.win, game.unx or game.ios to change. List of battle groups here. If the battle group is invalid, the last dialogue script is shown in the battle box under the YOU WON! text. The battle ends if you spare, flee, try to use an item, or act. The game crashes if you try to fight.(NOTE:To put the number you want you will need to convert the number you want to hex.) |
| Insert | Teleport to the next room in the room list. Places you in a specific position. |
| Del | Teleport to the previous room. |
| F3 | Places a file system_information_962 in your save folder. After game restart, puts you at the black screen after a genocide run. |
| F7 | Adds 500 gold. |
| F9 | Stops all sounds and music currently playing. |
| F10 | Toggle collision with walls. |
| F11 | Teleport to the room after Papyrus's boss fight (room_water1/idː82). |
| F12 | Restart room. |
| R + 6 | Teleport to Ruins tile puzzle room (room_ruins2/id:7). |
| T + 6 | Teleport to outside of Ruins exit (room_tundra1/id:44). |
| W + 6 | Same as F11. |
| F + 6 | Teleport to Hotlands water cooler room (room_fire2/id:138). |
| E + 6 | Teleport to New Home entrance (room_castle_front/id:219). |
| Y + 6 | Teleport to True Lab entrance (room_truelab_elevator/id:244). |
Battle Shortcuts
| Key | Effect |
|---|---|
| 1 | Halves game speed. Cannot go below 1 FPS, or game crashes. |
| 2 | Doubles game speed. Cannot go past 2x normal game speed. Crashes game if pressed too many times. |
| 8 | Shortens current enemy turn. |
| 9 | Extends current enemy turn. |
| F | Sets game speed to double normal speed. |
| W | Slows game down to 10 FPS. |
| Delete | Sets HP to 999 for current fight. |
| F6 | Sets mercy to 0 and attack to 9999. |
| O + P | Sets mercy to 9999, enabling the spare option instantly. Some enemies that cannot be normally spared turn into Aaron. |
Debug Flags
| To do: Which dialogue? |
| Flag | Line in savefile | Description |
|---|---|---|
| 4 | 5 | If set to 1, before Undyne's fight, her monologue will act as if you've killed no monsters, even if you've killed some. |
| 26 | 57 | Overrides murder level when set to a non-zero value. |
| 28 | 59 | If set to 1, holding C in dialogues will skip through them quickly. |
| 69 | 100 | If set to 1, changes Burgerpants' dialogue slightly. |
Area Specific
First Sans Encounter
Press J to zoom in on Sans, make a rimshot sound, and crash the game.
Alternate Reflection
The reflections of yourself in the puddles in Waterfall are replaced with a sprite of an unknown character when Space is pressed. According to the game files, the character seems to be Chara, but they also look like Kris from Deltarune.
Monster Kid Climb
Two numbers will appear over the player's head, starting at -1 and 0. The first number indicates the value an alarm is at (which alarm is determined by the second number), while the second number changes the first one and indicates Monster Kid's state.
Fight Specific
Lesser Dog
| Key | Effect |
|---|---|
| J | Increases head height. |
Undertale Steam Code
Papyrus
| Key | Effect |
|---|---|
| Spacebar | Sets Papyrus's next attack and dialogue to 'THE KING WILL TRIM A HEDGE IN THE SHAPE OF MY SMILE!!!' |
| O | If pressed when you are blue, Papyrus will not attack you, and will say '..' if you try to spare or attack him. |
Shyren
| Key | Effect |
|---|---|
| 3 | Increases the emotion variable, used during the fight to affect her status. |
Mad Dummy
A red number starting from 300 appears attached to the right of the Mad Dummy, indicating its health. Pressing A will set the number to 180, make the dummy float around, and make his next attack his 'FINAL ATTACK!' Stream my direct tv.
Undyne
Note: Undyne cannot be spared with the key combination O+P.
| Key | Effect |
|---|---|
| 7 | Sets HP to 999. |
| A | Decreases turn counter by 1. |
Asgore
A turn counter counts up from 0 in the top left corner of the screen. The higher the counter is, the harder Asgore's attacks are and the less defense Asgore has. Press A to decrease, press S to increase. If above 20, it is set back to 20 each time Asgore does his orange-blue attack. If set manually to above 22 or below 1, crashes the game when Asgore attacks.
Flowey
The text 'debug' in yellow comes down on the right side of the screen alongside Flowey. The intro and game over screens are skipped after the first death.
| Key | Effect |
|---|---|
| F3 | Creates system_information_962 in the save folder. |
| Home | Attack Flowey instantly. Does 6000 damage if all soul indicators are darkened. |
| Pg Up | Darkens the soul indicators in order, increasing damage and affecting the next soul battle. Disables darkening when all are darkened, and the next time a soul battle occurs, the game will crash. |
| Right Shift, Left Shift, X | Darkens the soul indicators in order, increasing damage and affecting the next soul battle. |
| Q | Starts the battle instantly during the intro. Does not stop the intro, so you cannot move and the attacks miss you until Flowey is closer. |
| W | Slows game down to 10 FPS. If used in Flowey's death state, starts the attack after Flowey's health is restored. |
| E | One burst of three stars from each eye. |
| R | One burst of seven stars from each eye. |
| I | Makes Flowey laugh and restart his attacks, including in a soul battle. |
| O | Purple Soul fight (books) |
| P | Green Soul fight (frying pan) |
| A | Toggle flamethrower |
| S | Saves battle state. Shows 'FILE 2 SAVED' at bottom left corner. |
| F | Doubles game speed. Lock on pellet attack. |
| G | Orange Soul fight (glove) |
| H | One hand-gun attack |
| J | Yellow Soul fight (gun) |
| K | Aqua Soul fight (knives) |
| L | Loads battle state. Shows 'FILE 2 LOADED' at bottom left corner. If there is no save, crashes game. |
| C | Toggles Flowey's mouth flap waving around. |
| V | Single vine attack. |
| N | Single F-Bomb. |
| M | Ball of teeth/dentata attack. |
| Shift | Deactivates souls one at a time. |
Asriel
| Key | Effect |
|---|---|
| C | Toggles Asriel's floating around and staying still above the middle of the screen. |
| Space | Same as above, but closer to the top. Asriel must be still for any of the below keys to work. Attacks stack and start instantly. |
| G | Chaos Buster/Chaos Blaster |
| B | Shocker Breaker/Shocker Breaker II |
| W | Chaos Saber/Chaos Slicer, slows the game down to 10 FPS |
| S | Star Blazing/Galacta Blazing |
| H | H Y P E R G O N E R |
Undyne the Undying
Note: Undyne cannot be spared with the key combination O+P.
| Key | Effect |
|---|---|
| 7 | Sets HP to 999. |
| A | Decreases turn counter by 1. |
Sans
| Key | Effect |
|---|---|
| E | Sets Sans' next attack to his special attack. |
| Q | Sets Sans' next attack to the part where he spares you. |
Free Undertale Steam Code
Note: This procedure involves editing a game file; create a backup copy of the file before proceeding. Use a hex editor to edit the 'data.win' file in the ame directory. Go to offset '000725B24' and change the '00' to '01' in the fourth row of that offset's line. While playing the game, enter one of the following codes to activate the corresponding cheat function:
| Result | Cheat Code |
| +100 Step | [Page Up] |
| Set attacks to 999 | [Page Down] |
| Increase battle group | 5 |
| Next room | [Insert] |
| Previous room | [Deleted] |
| Save | S |
| Load | L |
| Select saved game file | 0, 1, 2, 3, or 4 |
| Travel to room_fire2 (138) | F + 6 |
| Travel to room_water1 (82) | W + 6 |
| Travel to room_tundra1 (44) | T + 6 |
| Travel to room_castle_front (219) | E + 6 |
| Travel to room_ruins2 (7) | R + 6 |
| Travel to room_truelab_elevator (244) | Y + 6 |
| Spawn box (while in game) | G |
| +5,000 gold (while in a shop) | G |
| Take out panel | O |
| Put away panel | I |
| Increase murder level | M |
| Toggle room speeds | P |
| Set room speed to fast | F |
| Enable Undyne calls | U |
| Create file system_information_962 | [F3] |
| +500 gold | [F7] |
| Stop sound | [F9] |
| Pass through walls | [F10] |
| Travel to room_water1 (82) | [F11] |
| Restart room | [F12] |
| Show collision boxes | V |
| Fast walk speed | [Backspace] |
| Play current 'monster tale' determined by storyline | [End] |
| Battle current group (default is 140) | [Home] |
| Set HP to 999 (while in battle) | [Delete] |
| Slow down (while in battle) | 1 |
| Decrease speed (while in battle) | 2 |
| Decrease turn timer (while in battle) | 8 |
| Increase turn timer (while in battle) | 9 |
| Set mercy to 0 and attack to 999 (while in battle) | [F6] |
| Set mercy to 9,999 (while in battle) | O + P |
Note: This procedure involves editing a game file; create a backup copy of the file before proceeding. Use a text editor to edit the 'undertale.ini' file. Find the 'fun' variable, then change its name to Fun (case-sensitive) and change its value to anything else. You will now find new locations and NPCs related to a new character named 'W.D. Gaster'.
Hard modeEnter 'Frisk' as your name. If done correctly, you will get a warning that this will make your life hell. In Hard mode, you cannot retreat on the first turn of battles, will face tougher and new enemies, and can only hold three pieces of candy.
Developers' roomComplete the credits without touching any names. You will now be able to open the previously locked big door in Snowdin to access the developers' room.
