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  1. 1
    Mathematical puzzles of Sam Loyd

    Mathematical puzzles of Sam Loyd

    Published 1959
  2. 2
    IQ anda (edisi terbaru)

    IQ anda (edisi terbaru) by Tajuddin M.S

    Published 2000
  3. 3
    IQ challenge

    IQ challenge

    Published 2004
  4. 4
    Broccoli for the brain : 75 puzzles and exercises to boost your brain power

    Broccoli for the brain : 75 puzzles and exercises to boost your brain power by Noir, Michel

    Published 2008