Six Key Mine is number 9 in Robert Rose's Mental Block Puzzles series. This specimen is an original Rose, exceptionally rare to find. One of the six keys is labelled "MBP 9 6 Key Mine". This Puzzle won 1st prize in the 2003 IPP Puzzle Design Competition.It is one of the more unusual looking all-metal puzzles in the sense that it is neither squarish, rectangular, cylindrical nor just a sphere per se (like the Isis).  Rather the puzzle consists of a polished aluminium hollowed-out sphere or ball...

The Triple Dovetail Triangle is number 3 in Robert Rose's Mental Block Puzzles series. It is exceptionally sturdy and beautifully machined from aluminum.Shipping will be calculated after the auction ends.PayPal Family & Friends accepted.