Not paying attention in high school calculus just got whole lot easier thanks to an enterprising programmer named Hayleia. The game modder has created an open source version of Nintendo’s hit fighting series Super Smash Bros. that can be played on a TI-83 or TI-84 graphing calculator.

The stripped-down game is available for both single and multiplayer. Although right now it has only Fox and Falco as playable characters, the whole project is open source, and Hayleia is looking for contributors to help.

“The engine is really modular which (will) allow you to create your characters and play them in-game without even having access to the source code,” said Hayleia in a post on Omnimag, a website dedicated to calculator and PC games. “Speaking of which, the source code is completely unoptimized, but it is done on purpose. This way, people who want to edit it can do so very easily instead of digging through my usual unreadable code.”

Hayleia is calling the calculator game “Smash Bros. Open,” with the emphasis on “open” in all its senses.

“Those watching the tennis know that ‘Open’ can refer to a competition, which fits a game such as Smash Bros. pretty well,” the programmer said. “Those using Linux might think of open-source programs and other openness things.”

Nintendo’s new, 1080p hi-def version of Super Smash Bros. hits stores November 21. But those looking for a lo-fi fix before then can download the code here and upload it to a graphing calculator via USB.