9回裏だけ甲子園 is a free Android game developed by Goodia Inc. The game falls under the category of sports games and is a subcategory of baseball. The game's objective is to win the Koshien championship by achieving a walk-off victory in the 9th inning.

The gameplay is simple and easy to understand. The player can adjust the batter's position by moving their finger and release it to swing. The rules are also straightforward. The game is over if the player gets five outs. An out count is incremented by one when the player loses a game. The maximum out count can be increased up to ten.

The game's design is user-friendly and straightforward, making it easy for anyone to play. With its simple gameplay and rules, anyone can challenge themselves and aim for the highest score on the world rankings.

Note that the game features music from [12sound (Twitter: @ t_okmt_12sound)] and [Rich-media Music (Twitter:RichMediaMusic)].