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The word "Tetris" comes from the Greek root tetra-, which means four, and sport tennis, which is Alexey Pajinov's favourite sport, who is the original designer and programmer of Tetris.

Also all Tetris pieces contain four segments.

Friend mentioned this and it blow my mind

Source: Wikipedia

By this logic, Hungry Hungry Hippos is more Tetris than Tetris is Tetris

EDIT - Added a smile to make sure that people know that I'm not raging