From Kingdom Hearts Wiki: A world of information not accessible by Gummiship
A Prize Bug's body is nearly identical to a Prize Bug Blox; it is a yellow cube decorated by sky blue circles with red and white stars on the faces. A single, glowing yellow eye is present near the center of the front of its body. Four sky blue, purple, and yellow, spider-like legs sprout from its sides.
The Prize Bug's name references its insectoid appearance and resemblance to the Prize Blox.
Like most prize-bearing enemies, Prize Bugs are nonviolent and instead attempt to flee once spotted, soon vanishing entirely. The player should use swift, powerful attacks to slay the Prize Bug before it disappears.