There are four crystal heart pots that are not found in the normal game. To collect them, intentionally die and go through the Beach Of Souls to the next Beach Of Souls with the lighthouse. Then, get through the sequence of jumps sequence that are timed by the firefly to get the last four crystal heart pots. Note: Collecting these and all the other four crystal heart pots in the normal game will give you a total of 100 of them.