Tetris

The first block falls, you rotate it, slide it into the gap — and five hours later the falling squares are projected onto the inside of your closed eyelids. Tetris isn't just a game. It's a touchstone of what a perfectly simple idea can do to the human brain.

It was born in 1984 in the head of Soviet scientist Alexey Pajitnov, who programmed it on an Elektronika 60 computer. What followed were years of international legal chaos — the rights to the game were, during the Cold War, bought, sold, and litigated across borders in one of the most tangled disputes in gaming history. Nintendo ultimately fought for the portable rights, and that was the move that decided the entire handheld battle.

Tetris was bundled directly with the Game Boy as a pack-in title. And it was Tetris that sold the console — not to children, but to adults. Passengers on the subway, managers on planes, people who would otherwise never have bought a handheld suddenly found they couldn't stop. Easy to grasp within ten seconds, impossible to master perfectly — that is the definition of the ideal puzzle game.

The music contributed to the magic too. The main melody "Korobeiniki," an arranged Russian folk song, became one of the most iconic gaming tunes ever and to this day is inseparably tied to the falling blocks. The Game Boy's beeping sound gave it just the right hypnotic touch.

The numbers speak clearly: over 35 million copies of this version were sold, placing it among the best-selling video games in history. Tetris became a cultural symbol that transcended the boundaries of media, generations, and ideologies — few games have united such different people over such a simple task.

Why play it: Possibly the most perfect puzzle of all time — and the game that literally sold the Game Boy. One round is enough to understand why.