GeekDad Puzzle of the Week Solution: Lego my Ego!

Reading Time: 2 minutes

Again there were spectacular entries to this week’s puzzle and again my Geek Dad heart is warmed to its frostbitten cockles by the variety of answers I never would’ve predicted. It seemed like puzzlers either got this immediately or struggled mightily. And many, many of you referred to your kids — and not the geek adults! — coming up with the answer. That may be because it required out-of-the-box thinking. (Sorry…I designed this puzzle as much for the pun as for the challenge itself.)

Here’s the original:

With the following standard Lego pieces, how can you form a regular hexahedron, aka a cube?

12 of the following: brick 2×4′s

8 of the following: brick 2×3′s

8 of the following: brick 2×2′s

The correct answer must use all the pieces and, like a good cube, the answer must have six, defined, planar faces all of equal dimensions.

The trick was that a 2×2 Lego is not 2x2x2. You know those little square-top pieces we’ve been calling “cubes” all these years? Well, not so much. And so the most technically correct answer, as many of you found, was to build a 6x6x5 “cube” with a little hole in its center. Kudos to all who found this cool, non-intuitive solution. And kudos bordering on mad props to the burgeoning geek who submitted the following, which I also accepted:

Truly out of the box


But the winner of this week’s $50.00 ThinkGeek gift certificate is Jim, or more technically his 11-yo son, Jared! For those of you who didn’t win use this code GEEKDAD72JL and get $10.00 of your next order of $50.00 or more at ThinkGeek. Thanks for reading GeekDad and tune in Monday for another piece of cerebral performance art from Dave G.

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