Secrets can be found in the game mainly after obtaining the broom swap power up.
They are shown in the menu under the ??? item.
“Blue Square From the beach warp, go south five screens(by using the walkable offscreen tiles...Secret 12
“White Get to the place in the Debug World where you find Card 40, and flow down from the chest.Secret 13
“Sean From the entrance of the Debug World, go RIGHT, RIGHT, RIGHT, DOWN, DOWN, LEFT, DOWN. You...Secret 7