In battle, a Spiny Shroopa will hop at its target. To counterattack it, Baby Mario or Baby Luigi must use their hammers. After leaping the first time, there is a chance for a Spiny Shroopa to leap at its target a second time. Their attacks also have the ability poison their target.
Because of the spikes on the backs of the Spiny Shroopas, they can't be jumped on.
- The Spiny Shroopa's shell is similar looking to an unused Bros. Attack found in a screenshot before the game was released.
- HP - 16
- POW - 25
- DEF - 32
- Speed - 18
- EXP - 2 (8)
- Coins - 2