This is a unique Creative Crafthouse design. You must adjust the 3 wheels on the top of the box to allow the lid to pivot open. All 3 wheel must be correct at the same time. This is a great one to put a gift or gift card inside as it is easy to open if you know the combination (provided in instructions) but pretty tough if you do not.
Not crazy hard though, I would estimate 20 minutes as a respectable solution time.
Outer box measures about 5" x 2.67" x 2.8". Inner dimension (max size of object that could fit in box) are 4.6" x 1.9" x 1.6"
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Saturday April 25th
The box was nicely built, but I don't see how this is a level 7 puzzle. This was the first puzzle box I purchased and I had it open in about 30 seconds. I feel that you don't need to put much thought into it to find the solution. The next two puzzle boxes I tried were a level 7 and level 8 and I actually had to spend a decent amount of time on them and they provided a good challenge.