My web site of collection of brain teasers :http://isacisco.free.fr
2X2X2 3X3X3 3X3X3 (PICTURE) 4X4X4 5X5X5 CUBE (SHAPE PRESERVING) CUBE (SHAPE CHANGING) CUBOID OCTAHEDRON OTHER EIGHT-SIDED DODECAHEDRON FOUR TEN FOURTEEN TWENTY PUCKS SPHERE STAR HEADS & OBJECTS OTHER SHAPES MOVING HOLE MOVING MARBLES MOVING TILES SIAMESE & FUSED FOLDING ELECTRONIC PATTERN MATCHING OTHER MECHANISMS GAMES