Senkyu

Senkyu (戦球), known as Battle Balls in English, is an arcade puzzle game created by Seibu Kaihatsu and released in 1995.

A version for the Sony PlayStation was later released in limited quantities for the Japanese market and is now extremely rare.

The game consists of three colored balls that can be rotated clockwise or anti-clockwise falling from the top of the screen.

Bonus points are awarded for completing combos, chain-reactions caused by the falling balls.

[1] In 2001, Seibu Kaihatsu released two new versions of Senkyu named Gravure Collection and Pakkun Ball TV respectively.

In Senkyu , balls are affected by gravity, causing them to fall if there's open space, such as when balls are cleared