[I think that there should be a multiplayer option so you can play against others.] manedwinawesome is right, but I think you could start with a limited number of materials, build your castle, take turns, and buy your own weapons with points. Normal things like stones and logs would cost 1 point,explosives would cost 4 points, magical stuff would cost 8 points, and epic items would cost 15 points. This would be per throw, not to unlock. And yeah, whoever knocks down their opponent's castle first wins XP in the game.
