At IPP 28 2008 in Prague the participants received a cardboard drawing of this puzzle. I enjoyed making a few, this is the last one I have. An additional slide holder with the history of the tower
Exchange SLIDING. with PUZZLES The center piece can only slide up and down. Pieces cannot fall out through the transparent top plate. More assignments on the back of the puzzle. Material MDF.
The most difficult puzzle I have designed. The puzzle consists of 15 pieces. Some pieces can be slid under the edge. Goal: Make the numbers 1 to 9 from left to right in the frame There are different possibilities. But there is only one possibility to slide to a magic square. If you carefully open the puzzle (press the bottom of the title square piece) you will see a 4. Remember that.