"Splishity Splashity" virtually requires that you have unlocked the Wild Warhammer warrior weapon. You may have to complete some of the other maps first.
It helps to program the lights so that both lanes in the same direction have the green at approximately the same time, and so that both intersections of the same road have a green for the same direction of traffic at approximately the same time. This will require you to override the signals first.
 "Little Protectors"){kind=icon}
 "Protector IV"){kind=icon}
 "Gridlock Buster"){kind=icon}
 "Miami Simulation"){kind=icon}
 "Kingdoms: Nobility"){kind=icon}