|“||The I³ move up and down in a pattern, trying to crush Kirby as he walks by. Each I³ moves back and forth between two stone blocks, one on the floor and another up in the air.”|
|— Kirby 64: The Crystal Shards Official Strategy guide (BradyGames)|
I³ is a big, green, blocky, boulder-like creature that has a single eye. Its pupil is black.
I³ makes its debut in this game. It drops from the sky when Kirby approaches in an attempt to crush him. After it lands, it will then rise back up and stay up for a while, giving Kirby time to get by. It is invincible, like other obstacle enemies. I³ can often be found in a spot where there is little room below it, making it harder to get past. However, its predictability makes up for the difficulty of the enclosed space.
I³ was most likely given its name because it both has a single eye (represented by the "I") and is a cube-like monster (represented by the "³", which stands for "cubed").
Its Japanese name, ドネン (Donen), comes from the Japanese onomatopoeia for thud, ドン/どん (don). It may also be an anagram of the word for clay, 粘土/ねんど (nendo).
|“||I³s are cubes that fall on Kirby if he's under them at the wrong moment. Time your passage to avoid I³s. Don't touch them—even once they've dropped they can still hurt you.”|
|— Description • Kirby 64: The Crystal Shards Official Strategy Guide (Prima)|
- I³, Snipper, Sawyer, Plugg and Ghost Knight are the only enemies originating Kirby 64: The Crystal Shards to reappear elsewhere in the series.
- I³'s behavior is similar to Thwomp of the Super Mario Bros. series, as Thwomp also attempts to crash down on the protagonist. Their behaviour is also akin to the Thudd enemy from Kirby: Canvas Curse.