Level Unlock Hints:
Complete the levels to unlock new levels in Story Puzzle Mode.

Get Cenozoic Era:
Use story mode and complete the Mesozoic Era.

Get "Hidden" feature:
Beat the game with Master rank in all levels.

Get Ancient Civilization Era:
Use story mode and complete the Cenozoic Era.

Get Mesozoic Era:
Use story mode and complete the Paleozoic Era.