Signs appear as a black rectangular screen with a pink background along the edge. Coming out of two boosters on either side are two blue fire jets. As the sign is levitating in midair, these boosters are needed.
One type of sign can be interacted with. A sign with and arrow on it boosts Black Ball in the direction of the arrow.
Signs are placed in levels to tell the player about enemies, new objects, or tips on how to complete the level. Booster signs can also increase Black Ball's speed.