Transdimensional Teenage Mutant Ninja Turtles may very well be the greatest role-playing game sourcebook of all time. I’m not even being slightly hyperbolic. It is a book that talks about everything from dinosaurs to time travel, from wizards to parallel dimensions.
I suppose I should start a little further back: do you know that Palladium published the TMNT game, called Teenage Mutant Ninja Turtles and Other Strangeness? Well they did, and while the game is built on the rickety foundation of the Palladium system, the “Bio-E” mini-system for mutating your character from everyday animal into an anthropomorphic version is incredibly elegant. Transdimensional TMNT takes the “Strangeness” part of “…and Other Strangeness” and cranks it up to eleven. The real kicker, though, is that it has perhaps the most cogent system for time travel that I’ve ever seen, period.