Collect the all of the "R", "A", "N", "G", "E", "R" letters hidden in one of the following levels to unlock the corresponding bonus Ranger.

Ranger	How to unlock
Blue Galaxy Ranger	Lost Galaxy Part One level.
Blue Mighty Morphin Ranger	Mighty Morphin Part Two level.
Blue Overdrive Ranger	Operation Overdrive level.
Blue Wind Ranger	Ninja Storm Part One level.
Green Samurai Ranger	Ninja Storm Part Two level.
Lunar Wolf Ranger	Super Legends level.
Red SPD Ranger	Space Patrol Delta Part Two level.
Red Wild Force Ranger	Lost Galaxy Part Two level.
Yellow Mighty Morphin Ranger	Mighty Morphin Part One level.
Yellow SPD Ranger	Space Patrol Delta Part One level.