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Games like Simple 1500 Series Vol. 25: The Keiba
If you finished Simple 1500 Series Vol. 25: The Keiba, the closest matches are Gallop Racer 2004, Winning Post 7 Maximum 2008, Winning Post 7 Maximum 2007, Leading Jockey 2 and Winning Post 8 2017. All 10 share its racing genre and are ranked by how closely their themes and modes overlap.