TwoDots, the follow-up to Dots, is a spotty puzzle game which will challenge your powers of logic.
The idea of TwoDots is to clear a given number of colored dots by creating horizontal or vertical links between them. You can draw squares to clear all dots of that color on the board. When you clear dots new ones come to take their place.
There are lots of levels in TwoDots, although the game quickly becomes frustratingly hard to progress without buying retries or extra lives via in-app purchase.