Before you play
Browse DELTARUNE and UNDERTALE encounters in puskevi’s fan-made browser battle simulator, with separate fight and attack-practice options.
Unofficial simulator by puskevi, not an official Toby Fox release or the full DELTARUNE story. Title-to-menu navigation was checked on October 12, 2026; a complete boss fight remains unverified.
How to get started
- Allow the simulator’s resources to load, then press Z or Enter at its title screen.
- Select an encounter and read the menu: Z starts a fight, C opens run options and L opens attack practice.
What you need
Ready to startThe original site advertises account-free browser play. The title and encounter menu were checked; persistence of saves and complete battles were not tested. Use a desktop keyboard for the documented menu controls.
Controls
The title screen accepts Z or Enter. The encounter menu documents Z for fight, C for run options and L for attack practice. Read the current battle prompts for movement and actions.
Questions before you play
Do I need an account, and is progress saved?
The original site advertises account-free browser play. The title and encounter menu were checked; persistence of saves and complete battles were not tested. Use a desktop keyboard for the documented menu controls.
What are the current limitations?
Unofficial simulator by puskevi, not an official Toby Fox release or the full DELTARUNE story. Title-to-menu navigation was checked on October 12, 2026; a complete boss fight remains unverified.
