The Bloons Tower Defense series has the Spike-o-pult.Battletoads and Double Dragon: The Stage 6 boss can turn into an invulnerable spikeball.Unlike other spikeballs, they are in a slightly irregular shape. Battletoads: These are located in many stages like 4 and 6, and mean instant death for the 'toads.Another bunch of them hover up and down in the first Unexpected Shmup Level. Batman: Return of the Joker (NES): Spiked balls hanging from the chains is one of the first hazards you encounter.Adventure Island IV: Spiky balls are present in underwater sections.Abuse: Combines this trope with Asteroids Monster - huge spiky balls are inclined to drop on the player without warning, and when destroyed they split into smaller spiky balls.
