klotski is the sliding block puzzle in its purest form, a small grid of pieces and one stubborn goal: shuffle everything out of the way to free the block that matters. The genre asks nothing of your reflexes and everything of your patience, that satisfying tangle where the obvious first move is almost always the wrong one. It runs free in the browser with no download.

The lasting appeal of a puzzle like this is how a cramped board hides a solution that clicks into place only once you stop forcing it. Klotski is easy to start and genuinely hard to shortcut, which is exactly why the format has stuck around. If untangling blocks scratches the right itch, there are more puzzle games to work through.