Myst IV Revelation Cheats

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.

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.

You find an incomplete "chess-board" in the fireplace-elevator, which will take you down to the two books:

Numbering the fields on the incomplete "chess-board" starting at the bottom far left corner, left to right = 1 to 8, then next row 9 to 16 etc.... ending up with No. 48
in the upper far right corner field: Try pressing: 9-34-6-16-30-19-20