Merge pull request #1 from BladeWork/master

forks test
Merge pull request #2 from BladeWork/master

Merge Code changes from Renfa Feng
unknow changes
Merge branch 'master' of https://github.com/ZifengX/FinalProject.git
Merger Codes
New Codes for Renfa
Add different level images, add explosion.ts
Change Level
Change currentState in playButtonHardClicked to constants.PLAY_HARD_STATE
Merge pull request #1 from ZifengX/master

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