2/ Go round past the door, then along the top and get the gems and the key.
3/ Go back past the door to the bottom and get the gem, then go quickly over both traps to get the torch.
4/ Push the balloon and go back round past the door to the bottom to blow the dynamite up and get the key.
5/ Stand at the left of the boulder and push it once to the right. (You have to very quickly run back left and up before the gate closes or you will be trapped).
6/ Go past the door to get the chest and the key, then go through the door.