mdhughes' minimal game grid + game output pane + game input command pane. The green grid squares contain letters. Upon going north "N", you get text like You see O if the letter O was in that grid square. There are other commands like New, Look, say (and describe, help, and quit). It's running in my stock openbsd fvwm.
https://mastodon.sdf.org/system/media_attachments/files/113/710/331/019/244/489/original/09b629f3da01819f.png