Trials HD was a dirtbike game released for the XBox in 2009, the third game in the Trials series. It featured a truly arcane easter egg/riddle. For the successor Trials Evolution, the designers needed something more, enter the Trials Evolution Riddle, a puzzle spanning four continents and 100 years.
Trials HD is a game on Xbox Live Arcade that has been compared to a modern day excite bike. The game requires the player to ride a motorcyle through a number of physics based obstacles to progress through the game. Apparently, there is also a fairly elaborate riddle buried witin the game, revealed through a number of clues.
A Riddle: A wolf, a sheep, and a cabbage need to cross the river. How can you bring them across, one by one, without the sheep eating the cabbage, nor the wolf eating the sheep? [more inside]
It's Saturday night. You're here browsing on the internet. Why not do something intellectual for a change? [more inside]
Congratulations, you have just volunteered yourself to be part of this game. The aim is simple: get to the end !
The Maze. From the annals of the Internet: Before there was The Riddle, there was this "virtual space in the shape of a book" based on the quaintly illustrated Maze by Christopher Manson. Find the shortest path in and out of the maze, from Room 1 to Room 45 (the center) and back. At Room 45 is another riddle, whose answer is concealed somewhere in that shortest path, which, if you are clever, you can make in only 16 steps. "Anything in this space might be a clue. Not all clues are necessarily trustworthy."