What are your games that have the most replay-ability?

Tales of Maj'Eyal

For multiplayer:
Killing floor 2
Dead by daylight: somehow I keep comeback to this game.
Armello: I only have time to play few match weekly but it still fun.

For singleplayer:
Darkest dungeon: a lot of replay-ability, especially with mods.
Dying light: there so much to do, both in offline and online mode. I mean It been 4 years since it came out and dying light 2 is near, and this game still get update and event regularly.
Yakuza games: Another case of there too many thing to do in game.
Stellaris: This game have lot of replay-ability but you will need the dlc.

Earth Defense Force games

Solitaire. Been playing it for years.