Echo Gap

A number puzzle about distance: set up echoes, chain them, survive the rise.

Two Ns echo and vanish when they are exactly N cells apart.Echo Gap is a calm-but-tricky number puzzle about distance. Drop tiles numbered 2 to 5 into the board. When two equal numbers sit exactly that many cells apart in a row or column, they echo and disappear. Tiles fall, new gaps open, and a single smart drop can set off a chain.EASY TO LEARN, DEEP TO MASTER• One rule you learn in ten seconds: a 3 needs exactly …