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mf8 Son-Mum Cube II
mf8 Son-Mum Cube II

mf8 Son-Mum 3x3 V2


  • $44.99




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Product Description

The Son-Mum Cube II is an updated, more difficult version of the original Son-Mum Cube. With more pieces to scramble, this shape shifting puzzle is even more of a challenge than before!

Easy Returns!

Not completely satisfied with this product? We accept returns within 4 weeks (28 days) past the delivery date, for either store credit, or a full refund to the payment method — the choice is yours.

Click to see exclusions and more details on our returns policy

Our Promise to You

All of our products are guaranteed to be free of defects, or we will replace and reship at no cost to you. Please contact us within 4 weeks (28 days) past the delivery date to report any issues with items you have purchased.

Please note that some new cubes when being used for the first few times may experience what is termed a "pop". This is when one or more parts of a puzzle pop out without any damage actually being done to any of the pieces. This also occurs from time to time during normal usage. Pops are typically not considered a defect if the parts which come off can be reassembled by hand.

The corners on 2x2 puzzles should not be twisted as doing so may snap the piece. Damage caused by corner twisting is not considered to be a defect.

Fast & Free Shipping Available!

  • Free standard U.S. shipping (includes Hawaii, Alaska, and AFO/APO) (2-5 business days) is offered for orders with a subtotal of $55.00+. Free expedited shipping (1-3 business days) is offered at $85.00+.
  • All orders are shipped from our New York warehouse.
  • Orders are shipped the same business day they are placed, or the next business day. The cutoff for same day shipping is 3PM EST.
  • There is no processing/handling surcharge — all our shipping rates are at rock-bottom.
For our customers outside the U.S.:
  • We ship to all countries not sanctioned by the U.S. government.
  • We advise that you look into your country's customs laws before ordering.

Click to learn more about our shipping methods

Product Specifications
Manufacturer mf8
Type Shape Mods
Added 2019-09-10
Gross Weight 215g
Dimensions 67.0mm3
Item Weight 203.0g

Customer Reviews

Based on 1 review
J.P. (United States)
mf8 Son-Mum 3X3 V2

Great idea for a puzzle. There are a lot of moving parts to this one so some catching is to be expected.

I have not been able to utilize the diagonal cuts in the edges. I understand how they are to move but they catch so bad that I am worried that I will break a piece if I try to turn the puzzle like that.

The inner corner pieces (the corners of the "Son" part of the cube) are constructed in two pieces. a few of these came apart while solving. The part of the piece with the sticker would pop off leaving the other part still in the cube . . . still functional but with no way to know which piece goes where. I tried to take the pieces out by loosening the center screw. Be careful if you attempt this! The puzzle basically melted into a pile of pieces. I was able to reassemble. I super glued the inner corners so they would not separate again. Hint: If you find yourself in this situation, the three core pieces that are different from the rest all go around a single corner. Put all of the corners in as you assemble to core and go from there. After reassembly, the puzzle moved again. While scrambling, an inner corner twisted. I am unable to twist it back and am not really interested in disassembly again.

I have a hard time recommending the puzzle for the price. I feel that for $45 the puzzle should function and pieces should not come apart while attempting a solve.