Slot Crates are a type of crate. The inside contents of this crate constantly change faster and faster. When breaking it, the crate will give a prize depending on the image on the box. It can give Crash some wumpa fruit if it was showing an ?, an extra life if it was showing a Crash mug, an Aku Aku if it shows said character, a TNT crate if it was showing the word TNT in it, or even nothing if it was showing a pale white background. Different slot crates change between different prizes. Crash must break the crate at the right time in order to get the gem. Hence, when players do not destroy the crate in time it will eventually turn into an iron crate.
In Crash Bandicoot 3: Warped, slot crates have 4 different patterns: Nothing - Fruit, Nothing - Fruit - Life, Fruit - TNT, and Nothing - Fruit - Aku Aku.
Through hacking (in Crash 3), it is possible to discover way more patterns. Those include (but aren't limited to): Nothing (becomes iron box really quickly), Nothing - Aku Aku, and Life - Nothing - TNT - Fruit - Life (makes life appear twice in a row).