The automap reveals that this map has the shape of a human hand. After a small acident with a hammer... Go up the right side to the 'thumb'. A bit of wall sticks up behind a small lava pool. Step in the lava (briefly!) The wall drops and reveals a goodie.

For the next secret, get up the middle finger. At the end there is a hint. Sortof served with a sledge hammer. It opens a secret door. The other button... well, i'm sure you'll find out...

Between the ring- and little finger, there is a blood-splattered speckled rock. The rock to the right actually has the shape of an arrow... Tap the arrow-side of the bloodied stone and get a goodie.