Swervy Mervy and the Brain Cramp were prototypes (of Perplexus) and are not on the market. The manufacturer is working on new models (under new names) that will hopfully be introduced in the new year.
Review
Quite possibly the most popular toy we tested this year! The goal for this complex 3D marble maze, is to work your marble from start to finish through a series of 100 numbered challenge spots. It'll definitely take a number of tries to master, but the numbered track means you can chart and compare your progress. A huge hit with the whole family. NOTE: While we did have a few younger testers enjoy this, the challenge is more easily mastered by older kids and adults.
Manufacturer's Description
Perplexus is a bendy, trendy, can’t-put-it-down challenge!!! With 100 barriers, twists, turns, barriers, cliffhangers and more, Perplexus is the ultimate 3-D challenge! The entire experience will leave you perplexed and entertained all at the same time. If you make it to the end, pat yourself on the back...then go go get the next Perplexus challenge: Swervy Mervy or Brain Cramp. Can your beat them all?