Pendulum is a singular game, possibly with the most convoluted rules of any Solitaire in SoliLuxe (so far, at least). It really has "special everything": Special Foundation rules, special Tableau build rules, special redeal rules... and the fact that the closer you are to being a maths wiz, the more likely you are to complete it.

It's very hard to get a decent game going in "Pendulum", but once things get into full swing (as it were) it can be a lot of fun.