Numatrix

You control a cursor, clicking on numbered tiles to connect them. The goal is to clear the board by linking pairs of identical numbers. The path you draw can't cross itself or other tiles, which forces you to plan your route carefully. Some versions introduced obstacles or required you to use every tile on the grid. The pace is methodical, with the difficulty ramping up as the grid becomes more crowded. It feels like untangling a knot in your mind, one deliberate connection at a time.