From publisher blurb:
'TWAS - The Roleplaying Game Before Christmas is a rules-lite RPG, designed to be picked up and played with minimal preparation. It is inspired by the legends and literature of Christmas.
In 'TWAS - The Roleplaying Game Before Christmas, the players take on the role of various toys, brought to life by Santa Claus, so that they might save him from Krampus, the Christmas Devil, who has abducted the jolly old elf. What follows is an epic adventure, that will take them to the arctic wilderness of the North Pole and, eventually, into Santa's workshop itself.
'TWAS - The Roleplaying Game Before Christmas uses a simple set of mechanics expanded from the ACE Ruleset. Each Player Character has four attributes - Agility, Combat, Endurance and Magic - and three special abilities, selected from a set of twelve. Players can choose to either create their own unique characters, or play as one of the twelve pre-generated characters described in the book.
The rules use both playing cards and dice to generate random numbers, and indeed much of the adventure is randomly-generated, meaning that it is very unlikely that any two games will ever be exactly the same.