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This is the room.

I'm in this room and the objective is to get all the cubes on the lights, when I move them with the magnet buttons to smaller white cubes travel faster.

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Note that there is an achievement for beating this puzzle, but it is currently broken. –  BlueRaja - Danny Pflughoeft Jan 22 '12 at 19:35
    
I will point out that the game has been patched and the achievements are working again. –  murgatroid99 Feb 1 '12 at 6:42
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1 Answer

up vote 5 down vote accepted

First, extrude both red blocks completely. You want to end up with the blocks in a configuration like the following (not to scale)

 -----------------
|                 |
|rrr              |
|Bb   L   L       |
|                 |
|                 |
|rrr              |
|Bb   L   L       |
|                 |
|                 |
 -----------------

Where B is a big block and b is a little block. When you have that configuration, you should simply be able to activate the magnet on the right and if you turn it off at the right time all four blocks will be in the correct positions.

You should start by dividing the blocks with the top two above the lower red block and the other two below it. Then it took me a lot of moving with all four of the magnets to get to the above configuration. You can change the relative positions of the small and large blocks by taking advantage of the fact that the small blocks move faster. You can move a pair of blocks closer together or farther apart in the vertical direction by putting one against the red blocks and using the correct magnet to pull the other.

Basically, after dividing the blocks by the lower red block, you should have something like

 -----------------
|                 |
|rrr              |
|bB   L   L       |
|                 |
|                 |
|rrr              |
|Bb   L   L       |
|                 |
|                 |
 -----------------

If you activate the bottom magnet for the right amount of time, you should get something like

 -----------------
|                 |
|rrr              |
|     L   L       |
| B               |
|b                |
|rrr              |
|     L   L       |
|B                |
| b               |
 -----------------

Then by activating the magnet at the right for enough time, you should get something like

 -----------------
|                 |
|rrr              |
|     L   L       |
|   B             |
|    b            |
|rrr              |
|     L   L       |
|  B              |
|     b           |
 -----------------

Then activate the top magnet to get

 -----------------
|                 |
|rrr              |
|   BbL   L       |
|                 |
|                 |
|rrr              |
|  B  b   L       |
|                 |
|                 |
 -----------------

Finally activate the left magnet to bring the blocks to the original target configuration, and then activate the right magnet to move them all into the lights.

This exact sequence of moves may not be enough to get all of the blocks in the correct positions, but the general strategy of using the speed difference to move the small block around the big one does work.

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