So the next one in the series that I picked up was the Roller Coaster - this is the very latest addition to their catalogue and I was very lucky to be offered the chance to buy it before it actually came on the market. It has a striking similarity to the Ringleader that I reviewed last time, with the big beautiful spiral. This spiral really complicates the solving process and gives you the dreaded opportunity to not only tie the string in knots but also to have it wound around and around the spiral. Livewire have rated this one as "Very Difficult" and hell yeah! it certainly is.