A full Deltarune boss fight.

Clicking “Download” leads you to the GitHub page, which gives you instructions on how to load the game locally. Mobile users, if your controls become unresponsive rotate your device and rotate it back. This mod uses the Kristal engine and having it downloaded is a prerequisite to running this mod locally. There are options to change the difficulty of this game if you are struggling, scroll down on this page.

Mobile users might find the game harder to control. You may want to connect a keyboard to your device, which might work if you have a USB-A to USB-C cable. If the controls become unresponsive, a solution is to rotate your device and then rotate it back.

iOS safari users: If you want to play horizontally, you may notice that the web address bar is reducing the gameplay screen space. You can resolve this by tapping the icon to the left of the search bar (looks like a rectangle with two lines underneath), tap on ..., and then tap on Hide Toolbar.

If there are any issues, please report it in the issues tab in the GitHub repository.

From the README

In the first room:

• The center shelf gives you D$10. You can repeat this as much as you like. There is a shop somewhere for you to restock on items in case you toss them.
• The shelf on the center-right allows you to change or mute the music. If you’re streaming this, set the music to Abridged to avoid potential issues.
• The shelf on the top-right allows you to change the difficulty of the boss fight. This only impacts damage. Mobile users may want to ease up the difficulty to compensate the fact that the game is harder to control.
• You walk upwards to access the boss fight.

Challenges:

• No hit the boss, or play on a harder difficulty.
• Finish the boss after consuming two Instant Coffee items at the start of the battle, effectively making all bullets spawn and move twice as fast.
• Yes, using the Yellow Soul funny cheat (spamming enter while holding Z) once during the fight will will change one attack for the rest of this encounter.

Screenshots