You will have to discover a range of hidden and disguised tools to reach the final goal. No force is required to open the drawer.

40 A Plugged Well Puzzle Goal: Materials: Classification: Notes: Work your way through the puzzle to find the barrel of oil. Walnut, steel elements, and magnets 2.1 Trick or Secret Opening You will have to discover a range of hidden and disguised tools to reach the final goal. No force is required to open the drawer.

40 A Plugged Well Puzzle Solution:

41 Qin Nez Borz Puzzle Goal: Materials: Determine how the "Impossible" nested balls were created. Wood and electronics Classification: Slocum 10

41 Qin Nez Borz Puzzle Solution: The solution/explanation is withheld.

42 Rain Drop Puzzle Goal: Materials: Classification: Remove the glass tube to release the $1 bill. Spalted curly maple, walnut, cocobolo Take-apart

42 Rain Drop Puzzle Solution: Remove the base (by pulling straight off in a downward movement) and set aside. Remove Cocobolo magnetic top piece. Lay Rain Drop on its side, find out which side you can hear the steel ball rolling around on by tilting it end for end. This is the side you want facing up. Take the magnetic piece and wave it over the face side of the lower base section. Pick up the steel ball and try to "drop" it into the middle area, there you will find a small hole to hide the "size" of the ball. You will know when it has fallen into the hole by two ways, first, you may hear it fall into the hole, it has a quiet yet noticeable sound. Second, when you gently tilt the puzzle from end to end, you shouldn't hear the ball rolling around anymore. Gently roll the whole puzzle box onto its next adjacent side (being careful not to spill the ball out of the hole, keep tilted back just a bit). Now roll the Rain Drop over onto its face side, the ball should be trapped within the hole in the block. The block can now be jostled a bit to allow the glass tube to be slid out through the bottom and be removed from the puzzle.

43 Rattle Twist 4 Puzzle Goal: Materials: Classification: Disassemble and reassemble the two pieces inside the frame. Wood Interlocking

43 Rattle Twist 4 Puzzle Solution:

44 Ze RD - Evil Twins Puzzle Goal: Materials: Disassemble and reassemble the three nested geometric puzzles. Wood Classification: Slocum 3.2

44 Ze RD - Evil Twins Puzzle Solution: To open the Outer Shell, spin the ball hard. With the Happy Face facing up, it will expand and explode into 4 pieces Inside is a Rhombic Dodecahedron (RD), its derivative. You can open this by: a) A modified Stewart Coffin 3 finger Pennyhedron opening. Press and pull b) Or spin the structure. It will also expand and explode into 4 pieces The last baby RD inside opens like a rose. By pressing simultaneously the 3 triangles together, it slides and opens in coordinate motion. It has 3 SIMILAR pieces inside, a new discovery. REASSEMBLY Please follow the inside color markers of the pieces to maintain the outside pattern symmetry. For the outer 2 RDs, open and expand 3 of the pieces as far as it will go without collapsing. You use your left hand fingers as a jig. Place the inner RD inside and then slide the last piece in. You hear a click as it just start to close. Now flip the structure upside down and jiggle the inner RD until it is sitting snugly, hexagonal face facing up. The 4 pieces will now close completely. With the baby RD Place all the 3 pieces loosely together matching the color markings You see 2 triangular spaces in the centers, top and bottom. CLOSE OFF one of these triangles by pressing the 3 sides together. Now you can close the other big triangle space.

46 Rhombic Maze Burr Puzzle Goal: Materials: Classification: Notes: Slide maze and pin plates to remove a single exit plate. SLS nylon, stainless steel Sequential movement This is an enhancement of Kagen Schaefer's Maze Burr - using rhombic dodecahedral geometry. It allows for thousands of challenges including one requiring 379 moves to solve.

46 Rhombic Maze Burr Puzzle Solution:

47 Ring and Cherries on a Stick Puzzle Goal: Materials: Classification: Remove the metal ring. Natural form of wood, metal, rope and plastic Topological disentanglement

47 Ring and Cherries on a Stick Puzzle Solution: Follow the steps 1-6 to obtain the configuration 7. Then repeat the steps 1-6 with the other cherry and obtain the configuration 8, which yields the solution.

48 Six of One, Half a Dozen of the Other Puzzle Goal: Materials: Classification: Notes: Disassemble and assemble. Queensland walnut 3.4 Burr puzzles Magnets are used to improve the feel, and not theoretically necessary for the puzzle. The level of the puzzle is 13-1-4-1-1-2, it is challenging but not too difficult.

48 Six of One, Half a Dozen of the Other Puzzle Solution:

49 Slide Twist Twist Slide Puzzle Goal: Materials: Classification: Notes: Make a 3x4x4 block of gold cubes. Plastic, gold paint, 3 x Eastsheen 2x2x2s SEQ-GRP, ASS-CART The puzzle consists of three differently shaped parts--each with a 2x2x2 cube core which can twist and be scrambled.

49 Slide Twist Twist Slide Puzzle Solution:

50 Snake Case Puzzle Goal: Materials: Classification: Notes: Arrange so that the snake hides completely inside its case. Wood and cotton 3-D assembly No undue force is required. So please treat the snake gently, and do not stretch the snake too hard.

50 Snake Case Puzzle Solution: Follow the illustrated process to change the tube into a torus with a hole. Please reset this puzzle by following the process backwards after you enjoyed it.

51 Symmetrick Puzzle Goal: Materials: Classification: Lay the pieces flat to make a symmetric shape. Oak 1.1 2-Dimensional assembly

51 Symmetrick Puzzle Solution:

52 T4-II (Tea For Two) Puzzle Goal: Materials: Classification: Put the four pieces into the box. Wood, acrylic Put-together, sliding pieces

52 T4-II (Tea For Two) Puzzle Solution: Solution unavailable.

53 TetraCubed Puzzle Goal: Materials: Classification: Fit all eight pieces into the box so that the cubes do not touch each other. Also, make a solid figure from the four dark pieces. Wood, plastic Put Together and box-packing, and dexterity

53 TetraCubed Puzzle Solution: Hint: This is really three separate problems: 1. Build a regular tetrahedron using the dark pieces 2. Fit the tetrahedron into the box 3. As you close the box, place the cubes into each of the four empty spaces Solution: 1. To put the tetrahedron together, notice that the 4 pieces are two mirror-image pairs. Each piece has 6 triangular faces and 2 quadrilaterals. The large quadrilateral face has a right angle corner, and the smaller one doesn't. Take two of the identical pieces and put the two smaller quadrilaterals together. This will make one edge of the tetrahedron, and leave 4 triangular faces together opposite the edge. Put the other two pieces together (to make the opposite edge), and put the two sets of 4 triangles together to make the large tetrahedron. 2. To put the tetrahedron in the plastic box, just make sure each edge of the tetrahedron is exactly on the diagonal of a face of the cube. You will find that the empty spaces between the tetrahedron and the cube exactly allow for one of the small cubes to be in each corner of the box that doesn't have a tetrahedron vertex. 3. Use two small cubes in corners to hold the lower half of the tetrahedron, and then to hold the tetrahedron in place (with one hand) while putting the top half of the plastic cube on with the other. If you let one of the small cubes stick out a very little bit, it will hold the top half up so you can insert the last two wood cubes

54 Tetrakis Puzzle Goal: Materials: Classification: Assemble the four identical board pieces into the cubic frame. Padauk and maple Interlocking

54 Tetrakis Puzzle Solution:

55 Tetromino Tablet 18 Puzzle Goal: Materials: Classification: Put the five tetromino pieces into the frame. Wood, MDF, acrylic Put-together, sliding pieces

55 Tetromino Tablet 18 Puzzle Solution: Solution unavailable.

56 Triangle Puzzle Goal: Materials: Classification: 1) Make one square using all pieces 2) Make two squares using all pieces 3) Make as many different-sized squares as possible. 4) Make as many different-sized triangles as possible. Oiled beech Put-together

56 Triangle Puzzle Solution:

57 Tri-Symmetrics Puzzle Goal: Materials: Classification: In the given position, this object has 120 rotational symmetry. Make a new object that is even "more symmetrical": simultaneously with 120 rotational, 180 rotational, mirror, and central/point symmetries. Oak wood Put-together

57 Tri-Symmetrics Puzzle Solution:

59 Washington Monument Puzzle Goal: Materials: Classification: Notes: Unlock and open the puzzle, then close and then relock it. Wood (silver ash and jarrah), steel, and magnets 2.1 Trick or Secret Opening To open the puzzle, you must lock the internal gravity pins inside the round base. If you open the puzzle by chance then the gravity pins will still move freely--this is not the intended solution. To relock the puzzle, you must release the gravity pins so they move freely again. All the tools you ll require to solve the puzzle are given with the puzzle. Take care not to lose the "lightening rod" at the top.

59 Washington Monument Puzzle Solution:

60 ZooLogical Garden #2 Puzzle Goal: Materials: Classification: Notes: Put four white pieces into the tray. Put any three white pieces and the red piece into the tray. Acrylic Put-together The blue piece is anchored with the screw inside the tray, but can be rotated.

60 ZooLogical Garden #2 Puzzle Solution: Solution unavailable.