Your goal in Five-in-a-row is to get five X's in a row while preventing your opponent from getting five O's in a row. In this JavaScript implementation, the game is played on a 15x15 board. (If you'd like a bigger or smaller board, you can set it to any size from 10x10 through 20x20.) You play X's, and the computer plays O's. First move is yours. Enjoy!