You know Tetris—those colorful blocks that just won’t stop falling? Yeah, this is the one that started it all on the Game Boy. At first, it’s simple: rotate the pieces, slot them in, clear lines. But then the speed picks up, and suddenly you’re sweating, trying to shove a long piece into the only gap left before everything piles up to the top.

The music’s weirdly catchy too—that little Russian folk tune gets stuck in your head after a while. And even though it’s been copied a million times, there’s something about the original that just feels right. You’ll lose hours to it without realizing.

Still one of the best ways to kill time, even after all these years.