If you don’t mind a classic chess. Blitz/bullet/rapid/horde are different styles that don’t take as long to learn enough to have fun. Chess puzzles or against the computer are available if you want to keep it strictly single player. Lichess for multiplayer or I like chess tactics pro for puzzles.
Crosswords, there are programs like alphacross that aggregate from other sources to try different puzzles to find ones that aren’t too easy or hard.
ScummVM is my emulator of choice, like ePSXe it runs on phones and opens it up to a bunch of classics