This puzzle is know as Puzzle number 131. It is one of Laton's Challenges. The solution is worth 99 picarats. The solution to this puzzle involves weighing the items to determine which is lighter. I have added Puzzle number 5 and 131 to the related questions to assist in solving it.
this one is trial and error you take any four and out two on either side is on is lighter put the two on the heavy side back and put the two weights that were lighter on either side then the one that is lighter is the one you are looking for. However is when you start they are the same try again until one is lighter
Lighter
. Puzzle No 130: Too Many Queens 5! Inside the Golden Apple's House. This puzzle is also known as Too Many Queens 5. It is one of Layton's Challenges from the Golden Apple's House. It is worth 99 Picarats for the correct solution. Please see the related link below for a walkthrough of puzzle 130
heavier because they are two different weights
lighter
It depends on what your doing with it. If your towing, heavier. If your on the beach, lighter.
heavier when frozen
lighter
Helium is lighter than air
It is lighter
heavier by almost 1 amu
Darker or heavier depending on meaning of lighter