To get 100% on Crash Bandicoot you need to finish all levels and collect all Gems.
Every level has 1 Gem to unlock (Other than Boss Levels). To aquire the White Gems you need to break every box, Coloured Gems are the same but have an added difficulty that you cant Die.
To get 100% on Crash Bandicoot 2 you need to finish all levels and collect all Gems.
Every level has at least 1 White Gem to unlock (Other than Boss Levels). There are more ways to aquire White Gems than in the first Crash Bandiccot game. There are the usual 'destroy all boxes' Gems on every level plus some bonus Gems for clearing Death Routes and Coloured Gem paths. Coloured Gems require extra challenges.
To get 100% on Crash Bandicoot Warped you need to finish all levels, collect all Gems and collect all Relics.
Every level has at least 1 White Gem to unlock (Other than Boss Levels). There are more ways to aquire White Gems than in the first Crash Bandiccot game. There are the usual 'destroy all boxes' Gems on every level plus some bonus Gems for clearing Death Routes and Coloured Gem paths. Coloured Gems require extra challenges.