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There are three endings which can be viewed after completing Stage 5-4 on the corresponding difficulty (except 1 star (Easy), which has no ending). When you complete the game on any difficulty (except the 4 star difficulty), you will then loop through the stages again on the next-highest difficulty.
Ending #1:
Beat the game on the two-star (Medium) difficulty.
Ending #2:
Beat the game on the three-star (Hard) difficulty.
Ending #3:
Beat the game on the four-star (Very Hard) difficulty.