House Rules is a free board game for four or more people with a penchant for making their friends do ridiculous things. Players take turns racing around the board, drawing cards with rules on them each step of the way. While some rules come with the board, most rules get written by the players before the game begins. So while you might get a Board Rule that advances you three spaces ahead, your friend might get a Player Rule that makes them go back six spaces if they don't draw a good enough caricature of another player. 
Sound ridiculous? It is. Download the .zip and start playing.