When choosing your level in an era, hold down R1 and L2 and enter the following:
Open all levels: X, Square, R2, L1, Circle, X, Square, Square, Square Full regular carrots: X, Square, R2, L1, Circle, X, Square, Square, Circle Full energy: X, Square, R2, L1, Circle, X, Square, Circle, Circle All abilities:
X, Square, R2, L1, Circle, X, Square, Circle, Square See ending 1:
X, Square, R2, L1, Circle, X, Circle, Square, Circle See ending 2:
X, Square, R2, L1, Circle, X, Circle, Circle, Square
Thanks to Revolution readers Ben Hollobone and Abdelkader SROUJI!