Having the authentic "Klax experience", consisting of finally looking up what Klax is, watching the attract mode, going "wait, that's it?" and then never thinking about Klax ever again.
It's fascinating to read about how action-puzzle games were inspired by real-world puzzles, even as they converge on similar matching themes. Tetris, jigsaw puzzles. Panel De Pon, the 15-puzzle. Puyo Puyo, dominos.
Klax? That famously longevous puzzle, tic-tac-toe.