Like the name suggests, this is a basketball map. It is for 1v1 and two versions are included, bball.bsp, and bball2.bsp. Play the map in ctf mode and join opposing teams. To start the game, drop down into the room below where you start, each push your own button, and then walk into the thin holes. There is also a nice tutorial, so i'll let you figure the rest out for yourself :) gl.