Pong against the calculator, first to seven. The rally starts polite and ends frantic, because the ball speeds up on every paddle hit.
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Spin is the whole game
Where the ball meets your paddle decides where it goes next: catch it near the edge and it leaves at a steep angle, catch it dead center and it flattens out. Once you can aim your returns, you stop defending and start setting traps.
Controls
Up and down set your paddle gliding; ENTER stops it in place.
A beatable opponent
On lower difficulties the CPU is slow to react to a sharp angle; on HARD it tracks well and serves harder, but a well-placed edge shot still beats it. Your wins are saved for each difficulty level.