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XBox - Myst 4: Revelation cheats

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

Fireplace-puzzle in parents' bedroom: 
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. 
Submitted by Nurcee

Backup Power Box that Yeesha points out:
Shut off everything in the Waterfall room before pressing 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.
Submitted by Nurcee