Ammo Crates appear in the Cortex section of Classroom Chaos in Crash Twinsanity. Touching one of these crates breaks it open, and increases Cortex's ammo count by twenty. If one of these crates is broken, another one will reappear in its place after about half a minute, making it quite easy for Cortex's ammo count to reach 99.
|! | ? | Aku Aku | Ammo | Arrow | Basic | Bounce | Checkpoint | Copter | Crash | Detonator | Infinity | Invisibility | Iron Arrow | Iron Check Point | Iron | Locked | Magic Carpet | Nitro | Nitro Switch | Outline | Pants | Slot | Spike | Time | TNT | World|