HeroQuest-like rules?

Does anyone know of any rules (official GW, or homebrew) that allows gameplay similar to boardgames like HeroQuest? Would like to play a short game with kids where I DM as the baddies, and kids get to pick their heroes (each control a single mini, either a SM, or a SoB, or Inquisitor...). Would be nice if also had a bunch of scenarios (ie, different game objectives, like surviving, escaping, or just kill everything).