Change of Heart was the exchange puzzle of Hans van der Zon at IPP25 in Finland, 2005.Change of Heart is a sliding-piece puzzle with 8 pieces.The plain heart can be changed into the patterned heart and back again.When the middle piece of the puzzle is removed, the other 7 pieces can slide. They can be rotated in one corner of the puzzle.The puzzle comes in its original paper sleeve with instructions printed on the outside (see picture 4).= = = = = over 70 IPP25 exchange puzzles available, see m...

This nicely crafted turtle burr consists of 6 pieces, and requires no less that 8 steps to remove the first piece!I have no background information about this puzzle.It has intricate notches and sliding parts inside, see picture 4 (no spoiler, this picture is staged).If you like animal puzzles then you need this one (too bad it is not a hippo!-)

Triamant is a set of 16 equal 4-sided pieces in 8 different colors, which are hinged together to form a loop.It can be rearranged to more than 250 different shapes, which are stable on a flat surface.It is a lot of fun to play with, and the construction is sturdy (see 5th picture).Even the one-piece outer packaging is an interesting 3D folding puzzle! See pictures 2/3.See this  youtube demo video for a commercial presentation(the website mentioned in the video is not useful, it seems to be tak...

Towers of Riga was Andrejs Cibulis' exchange puzzle at IPP25 in Finland, 2005.The goal of this 3D packing puzzle is to  pack the 13 pieces in the hexagonal box.See 3rd picture for the original detailed description.= = = = = over 70 IPP25 exchange puzzles available, see my other listings = = = = =

Complete Insanity was the exchange puzzle of Rik van Grol at IPP25 in Finland, 2005.The goal of this puzzle is to place the 5 cubes in the base in such a way that from all (six) directions you see 5 different symbols.The base (tray) has 2 layers, a top layer with holes that fit the cubes, and a bottom layer with smaller holes to make the symbols on the bottom of the cubes easily visible.The symbols are laser-engraved on the cubes, the instructions are laser-engraved on the base.This puzzle com...

Karin's Cubes & Ladders was the exchange puzzle of Jürg von Känel at IPP25 in Finland, 2005.The goal of this puzzle is to select 16 of the 30 pieces and arrange them so that there is a continuous path from the lower left to the top right. See also the laser engraved instruction on the back of the puzzle (picture 2)The puzzle comes with a 54 page booklet describinig the puzzle history, analysis, and 24 challenges and solutionsThis puzzle is packed in a zip lock bag together with the booklet.= =...

Stuff the Turkey was the exchange puzzle of Harry Nelson at IPP25 in Finland, 2005.The goal of this puzzle is to re-assemble the 8 tetromino pieces in the frame, after "shaking them out of the box".The pieces are a bit loose on purpose, to make sure they drop out of the frame when the box is turned over.This ensures that the solver does not see the solution before attempting the solve.A second challenge is to put the empty frame in the box, and then re-assemble the pieces in the frame.This compl...

Alcatras was the exchange puzzle of Vaclav Obsivac at IPP25 in Finland, 2005.The goal of this puzzle is to take it apart and put it back together again.This is a four-piece coordinated motion puzzle.The wood is unfinished, this causes friction between the pieces.Therefore the coordinated motion solution requires accurate alignment.Three different wood types are used, the wood types are not specified.The puzzle comes in its original cardboard box, with with instruction sheet.= = = = = over 70 IPP...

Dissection 634 was Koshi Arai's  exchange puzzle at IPP25 in FInland, 2005.This 2D packing puzzle has 3 goals: pack all pieces in either the hexagon, the triangle, or the square area in the frame. A very nice geometrical dissection puzzle, lasercut from wood.The tray is rather large at 12 x 30 cm.= = = = = over 70 IPP25 exchange puzzles available, see my other listings = = = = =

 Double Take Checkerboard was Les Barton's  exchange puzzle at IPP25 in Finland, 2005.This 2D packing puzzle is two puzzles in one, see the 2nd picture for the full description.This puzzle comes in its original box.= = = = = over 70 IPP25 exchange puzzles available, see my other listings = = = = =

Four Pentomino Problems was Allan Boardmans exchange puzzle at IPP25 in Finland, 2005.One of Allans famous miniature puzzles: an 8x8 2D packing puzzle in a tray of no more than 5x5 cm! Very small (5,5 mm pixel size), very accurately made, very good looking, and very collectible.This puzzle has 4 goals, each indicated with 4 colored squares that are to be left open.See 3rd picture (partially blocked to avoid spoiling it for puzzlers with a phographic memory).This puzzle comes in its original stu...

Penny Farthing III was Lambert Wrights exchange puzzle at IPP25 in Finland, 2005.The goal of this very good looking disentanglement puzzle is to untangle the rope from the wheel so that Spokes (the rider) can ride again. See 4th picture fpr the original detailed description.This puzzle comes in its original exchange packaging box.= = = = = over 70 IPP25 exchange puzzles available, see my other listings = = = = =

Sleazier was Pavel Curtis' exchange puzzle at IPP25 in Finland, 2005.The goal of this 2D packing puzzle is to place all 4 pieces flat in the tray.The pieces are nicely made from transparent acrylic, the tray is partially transparent with a black background. The original solution sheet is included.= = = = = over 70 IPP25 exchange puzzles available, see my other listings = = = = =

7 L-ements was Greg Dye's exchange puzzle at IPP25 in Finland, 2005.The goal of this 3D assembly puzzle is to make a solid cube from the 7 different L-shaped piecesEach L-shape is cut from a single piece of wood and very smoothly finished.The puzzle comes in its original cardboard box with instruction label.= = = = = over 70 IPP25 exchange puzzles available, see my other listings = = = = =

IPP25 Suomi cube was the exchange puzzle of Kevin Holmes at IPP25 in Finland, 2005.The goal of this (small and difficult) 3D packing puzzle is to assemble the ten pieces into a 4x4x4 cube.The 10 pieces spell the letters/numbers  "IPP25 SUOMI".The puzzle comes in original plastic packaging box, with instruction sticker on the outside.It will be shipped UNsolved.= = = = = over 70 IPP25 exchange puzzles available, see my other listings = = = = =

Trivial was the exchange puzzle of Walter Hoppe at IPP25 in Finland, 2005.The goal of this beautiful laser-cut 2D packing puzzle is to pack the 3 identical heptomino's in the 6x6 square tray.The instruction and exchange informatio nis laser engraved on the edge of the tray.No additional paperwork is involved.= = = = = over 70 IPP25 exchange puzzles available, see my other listings = = = = =

DEN-Cube was the exchange puzzle of Takeyuki Endo at IPP25 in Finland, 2005.The goal of this 3D (dis-)assembly puzzle is to take the puzzle apart in to 4 pieces, and then put it back together in an alternative assembly, so that the IPP25 logo is flipped (not upside down anymore).The puzzle has 2 possible assemblies, so given the objective the solution is unique.The name is DEN-Cube, but it looks more like a burr shape.The puzzle comes in original zip lock bag with original instruction sheet.= = ...

Perfect Packing was the exchange puzzle of George Miller at IPP25 in Finland, 2005.The goal of this puzzle is to pack all 28 equal blocks (measuring 3x4x5 each) into a 12x12x12 cube.There are 3 different solutions, the most difficult one is distinctly non-symmetrical.The puzzle comes in original transparent packaging cube, which has a hinge on one edge toopen up.No instruction or solution is included with the puzzle.= = = = = over 70 IPP25 exchange puzzles available, see my other listings = = =...

4 x 4 Play Puzzle was the exchange puzzle of Karst Nauta at IPP25 in Finland, 2005.The goal of this puzzle is to make 3x3x3 cubes, with 4 different sets of pieces.Each time taking all 3 pentacubes and 3 of the 4 provided tetracubes.Each of the 4 combinations has a unique solution.The puzzle comes in its original wooden box with sliding lid, and includes the original instruction sheet.The yellow singe block is a bonus piece to make it more interesting to pack the pieces back in the box.= = = = = ...

Pentomno was the exchange puzzle of Peter Nischke at IPP25 in Finland, 2005.The goal of this puzzle is to pack and unpack the eleven (flat) pentacubes into the 4x4x4 cube casing.The cube casing is made of two halve (3 sides each) that have nine fixed cubes inside.The pieces are a bit tight, they require accurate alignment because of the sharp (i.e. not bevelled) edges.The puzzle comes in its original cardboard box, no instruction or solution sheet is provided.= = = = = over 70 IPP25 exchange pu...