Keys are rare items that vary from game to game:
- In the original Crash Bandicoot, there are only 2 keys in the entire game, and they're both earned by completing Cortex bonus rounds. They open up one secret level each.
- In Crash Team Racing and Crash Nitro Kart, a key is your reward for winning a race against a boss. They're required to access new hubs. By having the same number of keys as the locks on a door, the door will open (note that the number of keys won't decrease with use).
- In Mind Over Mutant, some keys must be found to open locked gates blocking Crash's way.