What is your favourite puzzle of ALL TIME?

My original Rubik's cube in a box which is handsigned by Rubik himself.
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well this is tricky. im not really into non wca puzzles any more and there are still so many more puzzles that i have yet to try. out of the ones that i have so far, i would have to say... shengshou 5x5. if i had these, one of them would probably be my favourite: gigaminx, 9x9.
 
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