Three party members
The battle opens with Kris, Susie and Ralsei. Read each character’s available commands before confirming your turn.
Step into Jevil’s arena with Kris, Susie and Ralsei. Play tripoid’s fan-made battle, choose your party’s actions and dodge the chaos.
Different opponents. Their own controls. Pick a game to begin.
Play Deltarune Fight Simulator online with Scube3000’s Battle Simulator V4. Start the browser game below, choose your controls and create or load a profile.

Take on Spamton NEO in The_CommanderRS’s fan recreation. Navigate party commands, move your soul and fire with Z.

Face Asgore in eekeekturtle’s UNDERTALE fan battle. Choose a command, time your attack and move through the next pattern.

Face Queen and Berdly with Kris, Susie and Ralsei in tripoid’s fan battle. Pick your party’s commands and dodge the next attack.

Challenge Undyne the Undying in tripoid’s UNDERTALE fan recreation. Choose Play, navigate your commands and face the spear-wielding heroine.

Play Jcw87’s Bad Time Simulator. Face Sans or choose Practice and Single attack modes to work on the encounter one attempt at a time.
Use a desktop or laptop with a keyboard. This project’s instructions use physical keys; this page does not add touch controls. A phone or tablet without a keyboard is not recommended.
Click the green flag inside the player. Click the game area to focus the keyboard, then watch the opening or press Q to skip it.
Use the arrow keys to move between menu options and Z to confirm. X cancels a selection. Check the active party member before choosing a command.
During an enemy attack, move your soul with the arrow keys. The creator lists X for slower movement, which can help with small adjustments.
Watch the battle’s HP and mercy indicators as you experiment with commands. If you restart using this page’s Reload button, the entire project starts over.

Jevil facing Kris, Susie and Ralsei in tripoid’s fan battle
Creator tip: if you choose to attack Jevil, tripoid suggests using Pirouette on the second turn. See the original project for the author’s full instructions.
The battle opens with Kris, Susie and Ralsei. Read each character’s available commands before confirming your turn.
The battle interface displays Jevil’s HP and mercy separately. Watch those indicators as you try the available actions.
The creator lists Q as the intro-skip key. Use it to reach the battle more quickly when starting another attempt.
This page embeds Jevil Fight, Scratch project 600739641 by tripoid, through TurboWarp. It recreates a DELTARUNE boss encounter as a standalone fan game. It is separate from Scube3000’s Battle Simulator V4 on our homepage.
The project credits Toby Fox for the music and game concept, Toby Fox and Temmie Chang for sprites, and Tuxedoedabyss03 for the carousel background. Visit the original project for complete credits. This site is an independent fan site, not an official DELTARUNE release.
This is Jevil Fight by tripoid, Scratch project 600739641, played through TurboWarp. The name Jevil Fight Simulator identifies this page; the original project is linked below the player.
Yes. The creator lists Q as the intro shortcut. Start the project with the green flag and click inside the player before pressing it.
Z selects options and advances dialogue. X cancels, slows your soul’s movement and speeds up text, depending on the current game screen. Use the arrow keys to move and navigate.
A physical keyboard is recommended. The original instructions specify keyboard controls, and this page does not supply an on-screen D-pad. Fullscreen alone does not add touch input.
No. Reload restarts the embedded project. This page does not save or restore the current battle, and V4’s profile-save instructions do not apply to this separate game.