- "More than anything, it lives to terrify people. It sometimes startles itself and bursts into laughter."
- — Battle Memory
The Surprise Box is an enemy encountered in Mother 3. It can only be fought once in King P's room in the Thunder Tower. Before Lucas and co. interact with it, it appears to be an immobile gift box similar to the other two in the room. However, when checked, it pops out of the box and initiates battle.
The Surprise Box is one of many enemies with unused back sprites.
Its battle sound is Battle Sound 45 which falls under Code Numbers 894 for regular attack, 895 for Smaaaash! and 896 for Miss. Unlike Ten-Yeti though, it uses physical attacks rarely.