2/ Go up and then right and own the side to get the torch and the key.

3/ Go back to the boulder and push it to the left.

4/ Go down but jump to the left to avoid the balloon rising.

5/ Blow up the dynamite at the bottom to the right and get the key from the bottom left.

6/ Get the torch, go back and blow up the other dynamite and get the other gems.

7/ Get other chests and key to finish.