Brain Bank (A Mini Puzzle Box)

Total number of pieces
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The goal of this 7-step puzzle box is to slide the money tile halfway out of the back of the puzzle. To end up with the money, you must insert the LEGO coin into the Brain Bank and somehow receive a return on your investment.

While solving it you must follow these rules:

  1. If you detach a piece and see LEGO studs (not counting jumper studs), then put it back and try again.
  2. Don't drop, bang, jar, or hit.
  3. Have fun solving it!

46 pieces

You can find free online building instructions and parts lists at

Stumped? Email mccuenomodels (at) for a PDF of the solve.

I NEVER sell models that I have not first tested and built myself. I have searched each model for problems and improved upon them before selling. If you ever have any issues, please message or email MOCHUB or me.

We ship globally. We've partnered with DHL to provide a seamless and reliable shopping experience.

After purchasing a product, our staff will select all the pieces needed to build the MOC. Instructions can be downloaded from our site. You will receive your package within 9-13 days. You'll be notified about your tracking link via email.

Orders will be shipped from the European Union, home of the LEGO® brand.

MOCHUB is powered by WLWYB's part service fulfillment. You can learn more about us on our About Us page or visit WLWYB's home page.

If you have any suggestions, questions or concerns, please get in touch with us and we'll be happy to answer them for you.