Uitgekenen op de Rubik Cube en op Sudoku, dan is hier een echte uitdaging."The ISIS is here! This is a new mind bending invention, said to be the most difficult puzzle of all time and almost impossible to crack! In fact, the designers of the ISIS are so confident of its supreme difficulty that they've put cash prizes up for grabs for those who manage to break the ISIS code"
ISIS Adventure Puzzle Ball at gadgetshop
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