Look out for the wooden signs from the Sign Painter. These signs give tips about new types of goo and other information about the current stage. These signs can be very helpful; for example, on the level “Fisty’s Bog,” a sign tells you “Pop a time bug to go back in time…by one move.” Time bugs are little white flying bugs. When tapped, a bug reverses the last move you made. So if you mess up you don’t have to restart the whole stage.