ASYNC Corp. is a puzzle game where the player is a worker at the title company, whose job is to assemble and ship packets by rearranging colored Units. The Packets must be rectangles or squares consisting of four or more blocks. To create a Packet, the player swaps Units from the opposite side of the screen; Units can only be swapped if it would create a Packet on one of the two sides. The game has several modes:
Leveling up is based on performance, with new color themes added with each promotion.