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Near infinitely replayable games that usually feature, random generation, perma-death, and brutal difficulty. 

Games inspired by the popular game where you organize falling blocks of different shapes to form complete rows

A turn-based game mechanic is the opposite of a real-time game mechanic. In a Turn-By-Turn mechanic (synonym), each player has to wait for the other to have played, so that they can play, and so on. This way, each player has the time to think about their strategy. TBT games rely less on action than real-time games.