Best Play Pro Yakyuu '90 is a baseball simulation game released in Japan for the NES. As a Japanese-exclusive title, its popularity is primarily confined to that market.  The game likely simulates the 1990 Japanese professional baseball season, allowing players to manage and play as various teams.  Specific details regarding the game's features and depth of simulation are not readily available without further research into Japanese gaming publications of that era.  Baseball games were a popular genre on the NES, with several other titles released during that timeframe.

Best Play Pro Yakyuu '90 (Japan)

Best Keiba - Derby Stallion (Japan) (Rev A)