I’ll go for something more simple, but that you still can spend hours on.
Tetris. Jstris if you want a minimalistic version and Tetr.io if you want something more polished.
I also like to play minesweeper, minesweeper.online is the best one I’ve found. I especially like the no-guessing mode which makes the game a lot less frustrating.
I like playing Tetris. You could either play 1v1 or battle royale style. It’s pretty frustrating at first but when you get a little good it’s basically second nature
Best ones I know are Jstris or Tetr.io. Jstris is more minimal and good if you don’t like flashy graphics and Tetr.io is basically the opposite of that.