Change ROOD with GEEL  Bottom slider left to right. & piece immovable.Pieces cannot fall out due to transparent top plate.Material Acryl.   

Put the same colours together. The white center piece can only slide up and down.Pieces cannot fall out due to transparent top plate. Matererial. Acryl.The pieces  are covered with transparent foil. You can slide without damage.

Slide de numbers from 1 to 14. 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 nummers are covered with transparent foil. You can slide without damage.

Put the 15 numbers in order.  Pieces can't fall out because of transparent top plate,More assignments on the back of the puzzle. Material MDF.The numbers are covered with transparent foil. You can slide without damage.The letters are covered with transparent foil. You can slide without damage.

Exchange PUZZLES  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 letters are covered with transparent foil. You can slide without damage.

6 PIECES 20X20 MM , 1 SLIDER 20X40 MM. BLOCKADE BETWEEN U & LLetters are engraved. 180 START POSITONS.  (2 Z PIECES)Place the letter in randomly.

12 pieces with inlaid letters. Pieces with tongue and groove. All pieces 20x20 mmSlide from the starting position ALBWHITE CK!!ET TO !WHITE !BLACK! On the back there is a slide up and down. This slide changes the free hole.Then slide to BLACK! WHITE!  easy?Material Acrylic. 

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.  The numbers are engraved in the pieces. Material acrylic.If you carefully open the puzzle (press the bottom of the title square piece) you will see a 4. Remember that.

Try to open the puzzle by removing the 4 cylinders with the numbers. (2014 is year of design). Inlaid numbers. Materal acrylic.If you have problems to open it, use the green tool.But try to find out why this tool is  in the BOX!!!GOOD LUCK!

    Everyone knows the problem of 8 queens on a chessboard, In the puzzle is a booklet with all the assignments. But I also came up with my own assignments. Material plastic.1. Make lines with 2 DOTS. Horizontal, vertical or diagonal. I found 32 lines 2. Do this also for 3 DOTS. 13 lines found. 3. Do this also for 4 DOTS. 8 lines found.

Old puzzle. Copy produced by puzzle design Ton Delsing.9 cardboard pieces.    The puzzle was patented in 1911, This variation on Thurston's puzzle was used as an advertisement for soap. The idea was to arrange the cards so that each center circle contained four different colors and each half circle contained two.

An old puzzle. Copy produced by puzzle design Ton Delsing.Assignment inside lid. See photo 3. 9 cardboard pieces.

During an International Puzzle Party (IPP) I received a drawing with 2 puzzlesfrom Serhiy Grabarchuk. I made it. Assignment on the back of the box see photo 3.Material 9 cardboard pieces.

21 pieces. Material Acrylic. Front black, Back white. Some problems to solve. See below.PUZZLE 1-   Use 21 pieces. Create a rectangle of 6x7 squares.PUZZLE 2-  Use 21 pieces. Create a rectangle of 3x14 squares.PUZZLE 3-  Use 20 pieces. Create a rectangle of 4x10 squares.PUZZLE 4-  Use 18 pieces. Create a rectangle of 4x9 squares.PUZZLE 5-  Use 20 pieces. Create 2 rectangles of 4x5 squares.PUZZLE 6-  Use 18 pieces. Create a square of 6x6 squares.PUZZLE 7-  Use 16 pieces. Create 2 s...

In a IPP special of his newsletter "PUZZLETOPIA" Nob published this L Puzzle12 pieces.This puzzle is a copy produduced by puzzle design Ton Delsing Front black. Back white. Put 12 pieces into  a 7x7 square. Black side up.Rotation are permitted, turnover is forbidden.Inlaid letters. Material Acrylic.

TRICK OPENING  I made this puzzle in 1980 in wood for my wife BEA. She passed away in 2015. I then decided to make this puzzle in acrylic,It has become a very special puzzle. It is a coincidence that this was possible. Be careful with it. Try to open the puzzle by removing the 3 cylinders with the letters. And be amazed at what is inside.  Inlaid letters. Material acrylic ,90x90x27 mmGood luck.Please note!! If your wife has the same first name, BEA, this is a great gift.If you have proble...

Copy of this puzzle made by puzzle design Ton Delsing in 2011

Copy produced by puzzle design Ton Delsing.F. D. The world famous Initials. Frank Delano Roosevelt's Initials.Registered U.S. Patent Office.The F consisted of 5 red pieces, the D of 6 blue pieces.Material. Thin Plastic.

Dutch Cube Day gift 2019.15 pieces. Materal acrylic. Some assignments in the box.

This puzzle is a copy produced by puzzle design Ton DelsingThe 2 cards of 1x2 and the 7 cards of 1x3 must be placed in a square of 5x5. In such a way that the color and the bird only appear once per row and column. The birds must be upright.9 cardboard pieces.