Tetris

There is a select group of computer games whose in-game logic is enough for them to simulate computers in themselves. We've seen it in Minecraft and DOOM, ...

The various moves and outcomes are referred to through a Tetris scripting language, so states can be represented by different sets of blocks and holes while logic elements can be be built up using the various shapes and the game logic. One might wonder how the Russian falling-blocks game could do this, as unlike the previous examples it has a very small playing field. There is a select group of computer games whose in-game logic is enough for them to simulate computers in themselves.