Ah, ok, I think I've worked out what to do! -- you need to select another player as a CPU, which requires navigating over to that box. Got it!
This is a contribution to the 2019 A Game By Its Cover game ja.
- Björn Ritzl - Programming, additional art
- Keith A. Wood - Graphics and original Famicase
- Sound effects from Freesounds and SoundBible