Myst 4 - Revelation - Platform: XBox

Backup Power Box that Yeesha points out:
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Make sure you have shut off everything in the Waterfall room before pushing the 
buttons at the Power Box. Click combinations until both symbols for the 
Waterfall are green. Then, go back and open the floodgate; watch your head.

Fireplace-puzzle in parents' bedroom:
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There is an incomplete "chessboard" in the fireplace-elevator, which takes you 
down to the two books. Number the fields on the incomplete "chessboard", 
starting at the bottom far left corner, going left to right: 1 to 8. Then for 
the next row: 9 to 16, and continue the pattern with 48 in the top far right 
corner. Note: Try pressing: 9-34-6-16-30-19-20.

Bug cage in Tomahna:
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While in Tomahna at the beginning of the game, do not open the glass cage 
containing the bugs unless you want Yeesha to get angry with you for ruining her 
experiment.