Approach the stick, chest, or wall slab and use the numpad "0" or whichever key you re-mapped to the Jump key. A good sequence for the stone circles room is this method I used:
Placed a stick in the low hole on the west side which then projected the slab on the east side.
Climbed the east slab and inserted a stick to make the slab on the south side protrude.
Climbed the south slab and jumped to insert a stick in the southwest hole (tricky to do - had to ready and jump at the same time) to protrude a slab on the north side.
Climbed the east slab and run-jumped over to the north slab then jumped to the exits.
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Rick
Beginner's Help, Hints & Walk-Throughs at
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