Highly recommend Shattered Pixel Dungeon!

Easy to learn, hard to master rouge-like dungeon crawler with enough under the hood dice rolls to give my inner RPG nerd the warm and fuzzies. Plus the developer is active on Lemmy pixeldungeon@lemmy.world

I can recommend Antimine if you’re into Minesweeper.

From me: 1010! Klooni - good block game available on F-Droid

I’m a Pirate Solitaire enjoyer, because I’m a Zachtronics freak lol

https://f-droid.org/packages/io.itch.pirate_solitaire/

I quite like Lexica.

Unciv, civilization inspired https://f-droid.org/en/packages/com.unciv.app/ Dont blame if you loose now all your day… ;-)

Minetest

ChipDefense :https://f-droid.org/packages/de.chadenas.cpudefense/