Trials Evolution follows in its precursor's treads by including a heck of a riddle, which some very clever detective work has already begun unraveling.
By applying codebreaking techniques to slabs of seemingly random text scattered through the game's environment, Redlynx forum member MurdocLoch was able to discover directions for some sort of cheat code.
You can see someone following the instructions in the video below; it unlocks a whole new musical track with very strange lyrics.
But that's not the end of the story, according to RedLynx creative director Antti Ilvessuo, who commented that players were "fast" in figuring out this step, but that's it's not over yet.
MurdocLoch's account of his work on the riddle is a great read; hit the link above to check it out and join in on the next phase of the puzzle.
Trials HD contained a sprawling scavenger hunt for seemingly unrelated clues, which unfortunately boiled down to a somewhat unsatisfactory solution.