I³

I3 (Donen in Japan) is an enemy from Kirby 64: The Crystal Shards. It is a big green blocky boulder-like creature, said to be possessed by Dark Matter, with a single eye, who drops from the sky in an attempt to crush it's enemies. I3 is invincible, like other obstacle enemies. I3 is placed in a spot where there is little room below it, making it tougher to get past. However, its predictability makes up for its enclosed space. I3 will drop when Kirby gets near, then rise back up. It will then stay up for a while, allowing Kirby to get past. I3's card is #32 on page 4/9.

Trivia

 * The 3 in I3 stands for cubed. This is likely because I3 is a cube-like monster. The I may be because it has a single eye.
 * I3's behavior is similar to Thwomp of the Mario Series, as Thwomp attempts to crash down on the protagonist.