I remember playing this game a long time ago, and I still do. The game is great, but there was some stuff that was stuck on. In the forest area, there was a heart piece that i was trying to find but i could never figure out how to get it. And at the lava area, i was in this cave with rocks that had numbers on them. I didn't have enough keys to progress, so I tried to figure out the puzzle but couldn't. I did manage to beat the boss but can you tell me what i am supposed to do at the lava area and how to get that heart piece? thx