That is easy to answer for me.
Mansion of madness
I have played so many rounds with so many different people. The game is complex enough that each round is different. But easy enough to geht people to start with. Easy to play hard to master.
The digital game master via APP is great. I had so many games in which the last player actions decided the game. After some hours of game time. Your actions feel so impactful.
I don’t know how the game does it, but in so many sessions the last actions are so important. I have often won the game within the last possible action. Such a great feeling.
Going from “easy, everything is fine” to “everything on fire, NPCs dead, several Monsters” in two rounds. Then winning by a clever set oft actions, where several player habe to coordinate, is peak feeling oft accomplishment.