Here is the Solution if you decided number 2 was the Unique weight
and it was Lighter than the others (followed by Solution if it was Heavy).

Weigh #1

Place 1 2 3 and 4 on Left side of scale and 5 6 7 8 on Right side
Left side will be Light . It indicates that it is 1 2 3 or 4 as Light or 5 6 7 or 8 as Heavy.

Weigh #2

Place 1 2 and 6 on Left and 3 4 and 5 on Right side.
Left side is still Light and it can’t be 6 3 4 or 5 (see earlier results)

Weigh #3

Place 1 on Left and 2 on Right
It is either Left side Heavy or Right side Light----1t cannot be that 1
is Heavy see earlier results- so it must be 2 is Light
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If your selection was weight number 2 and it was HEAVIER than the others:

Weigh #1

Place 1 2 3 and 4 on Left side of scale and 5 6 7 8 on Right side.
Left side will be Heavy. It indicates that it is 1 2 3 4 as Heavy or 5 6 7 or 8 as Light

Weigh #2

Place 1 2 and 6 on Left side and 3 4 and 5 on Right side.
Left side is still Heavy and it can’t be 6 3 4 or 5 (see earlier results)

Weigh #3

Place 1 on left and 2 on Right. Right side is Heavy. It cannot be that 1 is now Light (see 1st Weigh results).
Must be that 2 is Heavy.

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