Ever wondered if your old Super Famicom controller still works? This weird little test program from Japan is basically a glorified button-checker, but there's something oddly satisfying about mashing all the inputs and watching the on-screen display light up. It's not a game, really—just a diagnostic tool—but if you're into retro hardware, it's a neat way to confirm your controller isn't totally busted before jumping into an actual SNES title.

You'll see colored squares light up for each button press, and the directional pad gets its own little test area. The interface is all in Japanese, but it's simple enough to figure out. Honestly, half the charm is how barebones it feels—like digging up some forgotten tech relic. If you're emulating, it's a quick way to map your controls before diving into the classics.