The Triangle on Strings is basically a glass triangle on strings. Very rarely you will encounter this shape. It is found only in Checkpoint 8, Zen Mode and the bonus Credits Stage. It is also found in Local Multiplayer. You only need to use the Explosive Balls Power Up to destroy these in 1 shot. This shape belongs to the String Obstacle class, along with the Square on Strings, Pentagon on Strings, the Painting and the Hexagon on Strings.