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The Cluster Buster gets its name from the level of difficulty to get it apart. It has six symmetrical pieces and assembles relatively easily but you must know the right place to push with six fingers at the same time to get it apart.
All of the puzzles come with a card briefly describing the puzzle with some "hints" on how to assemble and disassemble the puzzle. So take care (maybe even notes) when you disassemble the puzzle so that you will be able to reassemble it.
Note: You should not have to force any pieces apart or together. However, because of the nature of the wood, humidity may effect the way the puzzle will fits together.