This video shows the puzzles at the front gate and in the mathematics hallway. The only puzzles in this region that change each time you play are the melody outside the castle and the initial ordering of the mosaic tiles. Notice the nice symmetry in the magic square puzzle. :) This page in the manual gives the copy protection codes, explaining the relation between the clues from the puzzles to the door at the back of the hallway: While these videos can be used as a guide to walk you through many of the puzzles, I encourage you to first try to solve them yourself. Unlike its sequel Island of Dr. Brain, most of the puzzles in this game have only one of each puzzle type. For example, the word search puzzle in this game is always the same, but in Island, the computer generates a new puzzle each time.
