In this special box you can find 27 wooden rods.
All of them have the same size, but are sliced differently inside.
To create a burr puzzle (interlock puzzle that has 2 rods on each side), you will need any 5 different rods + the 0 (zero) rod- which is the only fully squared rod.
Keychain Crystal - Wooden Puzzle
Disassemble and assemble pack the pieces all together!
You can play with it everywhere!
Once the shape is unraveled, getting it back into a cube turns out to be much harder than it looks.
A 3 x 3 x 3 cube made up of 27 pieces linked together by a stretchy string.