Klotski is a really fun puzzle game that involves moving little blocks around on a grid. The goal is to get one specific block, usually called the "hero" block, out of the grid by sliding the other blocks around to create a path.
Each block is a different shape and size, and can only move in certain directions. You need to use your thinking skills to figure out which blocks to move and in what order, to clear a way for the hero block to escape.
It's kind of like playing a game of pretend with your toy blocks, but instead of just making towers and bridges, you're making a specific pattern to solve a puzzle. It can be challenging, but really rewarding once you figure it out!