Vampire Survivors on the steam deck.
Zombies vs Plants.
Rimworld
RimWorld is a time machine. I start it up and then look at the clock and I’m 5 hours in the future.
I’ve once started a colony right before exams period. It was tough.
Ultima and Wing Commander, I know I’m showing my age but I guess it’s the nostalgia. I still go back and play through them.
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Civilization 4: Fall from heaven: Ashes of Erebus. It can be played multiplayer of course, but I almost exclusively play single-player. The lore is fun, the event system can be interesting, the combinations of awesome Civs+Leaders+Religions+Magic really up the replayability. The end game with hundreds of units amongst a large number of factions with hell terrain encroaching makes for a very dynamic endgame.
Fallout: New Vegas