The Pentultimate has not been massed produced until now. Congratulations to Cube Depot for offering a stickered version of this puzzle. This is, in fact, a more difficult puzzle than the ordinary Pentultimate since the dots on the centers make it a Super Pentultimate and hence more difficult to solve. Having said that, this puzzle shares the same problem that all MF8 Pentultimates share, namely, the rails tend to separate. This (depending on your mechanical skills) leaves the puzzle broken or a pain in the neck to "re-rail". A challenging solve.