If you would've told someone back in 1984 that Alexey Pajitnov would become world renowned, they would've likely laughed you right out of Russia. But on June 6th of that very year, said individual created what's easily the planet's most recognizable puzzle game: Tetris. We mean, who didn't have a childhood obsession with playing this very title on a TI-83 calculator while professors figured you were toiling away on classwork? Ah, good times. Feel free to share your best memories in comments below, and remember, there's no shame in tearing up. Or longing for a "T" to come along and fill that one last gap there on the right.