Make an UNDERTALE mod without code

Rewrite dialogue, make anything talk, swap music and test any fight, all by clicking. A walkthrough of Determination Studio.

Determination Studio is a 2D editor for UNDERTALE. It reads your own copy of the game and shows you every room the way it looks in the game. You change things by clicking, then press TRY IT to play your mod.

1. Pick a room

The Hierarchy on the left lists every area (Ruins, Snowdin, Waterfall, Hotland, New Home, True Lab) and all 336 rooms by their real names. Click one and it appears in the Scene in the middle. Drag to move around, scroll to zoom.

2. Click a character and change what they say

Click anyone in the scene: Toriel, Sans, a shopkeeper, a sign. The Inspector on the right shows their sprite and every line they say. Type over any line. Words like {yellow}FLOWEY{white} keep the game's colors.

3. Make anything talk

Pick something that doesn't talk (a rock, a door, a tree) and press + MAKE IT TALK, or use + TALK SPOT to drop one anywhere. Type your text boxes. In the game, walk up and press Z.

4. Swap the music

Open MUSIC at the bottom, find a song (MEGALOVANIA, Bonetrousle, Spider Dance...) and press REPLACE. Pick your own MP3 and it's converted for the game automatically.

5. Change how the game starts

Under GAME, click ♥ Player to set starting gold, HP, attack and defense, or ☼ World to make random battles happen more, less or never.

6. Press TRY IT

Pick a room to start in and, if you like, a fight: any regular monster or a boss like Toriel, Papyrus, Undyne, Muffet or Mettaton EX. Your mod plays in its own profile, so your real save is safe.

7. Share it

EXPORT .ZIP makes a file anyone with Determination can drag in and play.