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Tetris is perhaps the most instantly recognizable, popular video game ever made. Sales of authorized copies total near $1 billion to date, and that is just a fraction of the money made from knockoffs and pirated versions. Based on an obscure board game, it was designed for early computers, became a hit on TV consoles, and soared in popularity with handheld devices like the Game Boy. Today it lives on in smartphones, tablets, and laptops.