Linear war is best used as a review game. Set up: Make your own deck: 11 lines. Each line should be drawn so that it passes through at least two points with integer coordinates. Mark each line card on the graph side with some insignia. Decorations and alterations are made sure the do not obscure the line, but it makes it nice looking and personalized. War: 2-4 players. Each needs a deck of 11 face down cards, shuffled or not. Set aside any extras, make one more if you need it.
Players roll the die for the combat. Flip over the top card of the deck and follow the combat rule. Play through the deck once. The winner is the player at the end with the most cards. There are different ways of playing the game. Here is the link to the website with free materials on it: http://mathhombre.blogspot.com/2011/07/linear-war.html