This looks interesting... can someone explain this to me? And is it hard to pick up?
Well, I can try to explain it, but the basis of the game is as follows:
Blood Bowl is a game of fantasy football that takes place in the Warhammer 40K universe with many different races. You choose a race to play as, construct your team and take to the pitch in a game where tactical movement and strategy is just as important as the rolls of the dice.
Dungeonbowl is a variant of this game that takes place in a dungeon. Rather than playing a team with one race, teams can be made of 3 races with limits of how many of each race you're allowed on the team. This dungeon houses the ball in one of six chests: the other 5 are rigged with explosives. The dungeon is also fraught with peril, including spike pits, lava gutters and even sinister creatures waiting to take you out of the dungeon and straight to your grave. The first team to find the ball and score wins the game.
As for how easy it is to pick up, patience dictates that quite a bit. Both games (but I'll speak more from Blood Bowl experience as I've played it a lot more and I'm presently in our GOG league) can really sink their fangs into you, and the game is as rewarding as it is punishing, too. If you have the patience to sit down and learn the systems, it can be one of the most enjoyable games out there. The difficulty curve is steep, but you'll catch on soon enough.
Also, if you're interested in Blood Bowl, it's on sale on Steam for $10-$15, based on the edition you pick up.