Blockade is a relatively new game created by Lakeside. I used to play it as a kid, but I dont see it in the stores anymore. Each player starts with two pawns on designated spaces near their side of the board. They each have (typically) ten blue walls and ten green walls, which fit in the slots between the grid squares and are two squares wide. A players turn consists of moving his pawn two spaces and then placing a wall anywhere on the grid. The object is to get one of your pawns around the obstacles being set by your opponent and onto one of his or her starting spaces. It is illegal to block a pawn completely from being able to reach either goal.