Loki's exhibit was a game which was a tribute to the British TV show "Knightmare." In the TV show, a team of four youngsters would try to complete a quest in a computer-generated dungeon, one acting as the dungeoneer, who wore a helmet that covered his eyes, and three "guides" who observed their comrade in the simulated dungeon via a TV screen. The Second Life version was somewhat different in that you could see what your avatar was doing. But otherwise it held the spirit of the show.
You can see the first episode of the TV show (here). While not necessary to play the game, it does show a little about what it took in the late 80s and early 90s to make a virtual experience.
Loki's exhibit is at SL13 Beguile (150, 126, 24)
There's no prize here, other than simple scary fun.
Mad Monster Mountain is at SL13B Spellbound (171, 138, 21)