[PICO] めざせプロ野球 | "Mezase Pro Yakyuu" for Sega Pico 

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Argh, it's another one of these sports games that try to cram EVERYTHING into the touch tablet controls, and it BARELY EVEN WORKS in emulation. A lot of the reason I seem so lousy at this game is because the controls are incredibly unresponsive.
This is a very text-heavy Baseball game that not only teaches you the rules, but also has a lot of info on the Japanese baseball teams.