The aim of the game is to resolve wrong doing events over the four timelines, the premise is that Biff has got hold of the time machine again at some point and has removed a load of the key items which Marty and Doc use to complete their missions. The guitar from the high school so Marty can't play that all important Earth Angel track which made his parent kiss for the first time...or the skateboard which Marty uses to flee from Biff's gang in 1955 resulting in Biff eating the manure! BLEUGH!! You resolve events and make sure they go according to plan, using rolled dice. These allow you to punch out Biff (the fist symbol), travel back and forth in time (the flux capacitor), to different locations in the timeline (the "forward" symbol), to resolve any symbol (the wrench) and lastly to remove Paradox's (the 'Doc' symbol). More about those in a sec. For every event cleared you receive an item, which you then have to navigate through time and replace in its' rightful place. All the while, you need to move Biff out the way by punching him out of the way, and if you don't resolve Paradox's in time then slowly but surely you'll run "Outatime"! I couldn't sit still in my chair while playing. The parallels with the films are amazing, and just the fact that the rules allow you to "leave" items in the past for future players to use is amazing. You really get the feel of travelling through time and putting right what Old Biff messed up. With all the events on the board, it's sometimes quite difficult to clear them all and it gets really tense! Unlike most games, this is more of a co-operative game where all players can get stuck in on each others turns and discuss how to play out the dice.