It's Pong, very much like Pong by Atari® in 1972. First to 11 wins. Use Up/Down Arrow Keys or W/S when battling CPU. In local battles, the left paddle is W/S and the right paddle is arrow keys. Go for the highscore - there are two ways to get a highscore 1. Get a better record - get more wins or fewer losses than the highscore. 2. Tie the current record, but with a better time. Either last longer if you end up losing, or beat the CPU quicker.
Credit to Atari® for the original game. Hall of Fame (people who have beaten Nigh Impossible): Currently, absolutely no one