beFUNge?

It's a text editor with a programming language or something.

The challenge level hits the virtualharby Game Jam theme and was my original concept. I made it mostly during LCOLONQ's 2048 follower 20:48 stream, so it's here to taunt him, too.

Bugs in the jam version:

• On the challenge level, the text should ask for an output of exactly "You win" (no exclamation point).
• The sleep duration is slept after every "step" -- you'll probably want to drop the sleep duration once you've paused if you're using that feature.
• The implementation is out-of-spec in that it crashes when popping an empty stack, when the spec says the stack is essentially initialised with an infinite list of zeros. I'll probably make this an option ("strict mode" or something).
• The editing is annoying because the keyboard grab is only released when you hit escape ("clicking off" doesn't work).
• The highlighted cell is the instruction after the previously executed instruction, not the next instruction, or even the previous instruction (this affects the # instruction in a particularly confusing way).

Now repaired to work on Itch using the "full screen" mode; if you've no luck here, there's a working copy with the most of the above bugs fixed on my Clonq pubnix space over here...