In the menu, select a map, then press play. Buy towers, and upgrade them, those are for all (). Buy Gobo and upgrade the "Can detect transparent cats" for good because the other towers can't detect those. () = a tower, Nano, Giga, Gobo, Pico. The black number on the left bottom is the current wave and the waves in total. Don't let the cats go out of the stage. You can also sell the current tower
