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1. How to make checkpoints???like if "Player" collide "Stage 2 board", "Player" make checkpoint and if "Player" die "Player" will restart from it.
2. How to make Healthy???if "Player" collide "Meat" his healthy increase, if "Player" collide "Enemy" his Healthy discrease???And if his healthy empty "Player" destroy.
3. How to make Life???if "Player" collide "Heart" his life increase, and if his life empty "Game Over".

The SEARCH button (above and to the right) would be a good place to start. These same questions have been asked and answered many times.