A promotional board game issued with the Video release of the movie.
The rules are listed on the game board itself, as well as a note that you need to provide your own die and counters.
From the game board:
"Help Westley to rescue the beautiful Princess Buttercup from the evil clutches of the kidnappers. All you need is a dice, counters and the bravery to outwit the monsters and win the battles in your quest."
A simple roll-and-move game, with the odd square providing bonuses such as "Win the fight with rodents of unusual size. Go forward 3", and the occasional problems such as "Delayed by torture, go back 3".