Claim: Senkyu, which is also known as Battle Balls, had two versions that were released in 2001 and both versions were single-player games.
Evidence: Senkyu (戦球), known as Battle Balls in English, is an arcade puzzle game created by Seibu Kaihatsu and released in 1995. In 2001, Seibu Kaihatsu released two new versions of Senkyu named Gravure Collection and Pakkun Ball TV respectively. Both are strictly single player games and feature live-action video clips.