Thursday, 4 February 2016

Antislide Tetramino

Antislide Tetramino

Vladimir Krasnoukhov, Russia. The AT-Puzzle was also Vladimir's IPP35 Exchange Puzzle. For some of his other very nice puzzle designs, click here and here.

Manufacturer & Availability
Manufactured and sold by Vladimir himself. He may still have some copies available. 

Type & Classification
2D Packing

13.5cm x 7.5cm x 0.6cm

Materials & Construction
Laser cut acrylic used throughout. 3mm thickness for the pieces and the tray. Excellent quality and Vladimir went one step further by providing a red piece-holder so that all the pieces are are nicely held together when not in play.

This is not just your usual packing puzzle, but one with an added task; to pack all the 5 tetramino (each piece is 4 units) pieces into the tray in such a fashion that none of the pieces can slide (or move) in any direction. As a pure packing puzzle, this would have been a no-brainer, but with the anti-slide requirement, the AT-Puzzle becomes a very difficult puzzle indeed!

I took the better part of a day and still couldn't figure out the solution and decided to email fellow puzzle collector George Bell (who had solved it a while back) for a clue. But before he replied, something clicked in my brain and I tried arranging the pieces in a new way...and there, within seconds...I had solved it! I usually don't spend so much time on any one puzzle, but this one just drew me in and I went on and on playing with it, refusing to give up. I wish I could do the same for burrs.

Difficulty Level
Very difficult! thinking outside the norm is required no less. If you wish to see the solution, please click here - Password - antislide.

The AT-Puzzle is absolutely fantastic. It is also George Bell's favourite. So innocuously simple looking yet extremely challenging for a 5-piece puzzle. One of those puzzles that once you pick it up and know what you have to do, you simply can't put it down.


  1. Great job solving this, Jerry! Anti-slide puzzles can be very difficult, the requirements are very different from the usual packing puzzle.

    The first anti-slide puzzle (I believe) was invented by Wil Strijbos and asks for the minimum number of 2x2x1 blocks which can be put in a 3x3x3 box such that none can slide. I have never seen a copy of this classic puzzle!

    1. My mistake, the box is 4x4x4. Here is a link to the puzzle: