Use a search engine, such as Google, to look online for games from the "Backyard Baseball" series. Since the series started in 1997, there have been 11 different versions of the game. The children's baseball video game series last had a game released in 2010.
Versions of the game "Backyard Baseball" can be found at Game-Oldies and Silver Games. Game-Oldies has the Nintendo and Game Boy Advance version of the game, running through an emulator. The Silver Game website has the "Backyard Sports: Sandlot Sluggers" version of the game.
To play the game online, you must learn the controls. For the version on Game-Oldies, use the arrow keys on the keyboard to replace the D-Pad commands. Click Enter to start, and click Space for select and insert coin. For the buttons, use the "X," "C," "V," "B," "S," "D," "F" and "G" keys on the keyboard. It may take some getting used to. The "Backyard Sports: Sandlot Sluggers" game on Silver Games uses the mouse to control it.