Eat the pixel picture! Tap a numbered cube: it takes a waiting slot and that many ants march out to carry away tiles of its color.
Ants can only reach tiles that touch open ground, so you eat the picture from the outside in. A ringed cube has tiles it can reach right now. A \"?\" cube shows its color once it reaches the front (from level 25), and chained cubes (from level 50) can only be tapped together, when both are at the front. If every slot is stuck on a color with nothing reachable, the colony jams!