[Luzion]

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this puzzle is only solvable in 3 steps when using a balance scale.

and it is not too tough, but a bit fun.

separate into 3 piles of 4 rocks: A, B, and C

assume odd rock is light.

Place A and B on the balance. if balance = even, odd rock is in pile C. if uneven, odd rock is obviously on the lighter scale.

you now have a group of 4 rocks and one is odd, and can use the balance scale two more times.

Seperate this group of 4 into 2 groups of 2 stones: D and E.

again, lighter side contains the odd rock.

finally take these last 2 rocks, balance them on the scale. lighter rock is obviously the odd rock of the 12.

[/ QUOTE ]

What the hell man... the hard thing about this puzzle is NOT KNOWING if the rock is gonna be heavier or lighter then the other 11 rocks...

Anyone couldve solved it if we already knew ahead of time if the rock was heavier or lighter then the other rocks