Anyone interested in the light RPG Sword & Shield might be interested to know there’s a skirmish version out now. It’s a very rules-light wargame that could easily be converted to an RPG or even a Hero Quest style dungeon bashing boardgame. One player controls the adventurers and the other controls the monsters.
Despite the similar name, it actually uses a different mechanic to resolve combat. You simply roll a d6 (sometimes more than one) equal to or under a model’s ability score. For example, if you character has a Fight score of 4, you need to roll a 4 or less on 1d6 to hit your target. Targets get a similar armor save roll to avoid a grisly fate.
I’m not a fan of table top wargaming (other than epic Space Marine back in college), but I could be persuaded to give these rules a try. As I mentioned, it’d be easy to tweak them a bit to turn it into a dungeon bashing boardgame.
You can dl them here for free, if you’re interested. Cheers.