Mario Strikers: Battle League will get free DLC content updates that include new characters. A demo is available to try now through Nintendo Switch Online.
Mario Strikers: Battle League second free update launches in September - adds Pauline, Diddy Kong, Barrel gear, and Planetoid stadium - Gematsu
Mario Strikers: Battle League - Wikipedia
Free Update for the Mario Strikers: Battle League Game - Play Nintendo
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Mario Strikers: Battle League (2022), Switch Game
Mario Strikers: Battle League
Mario Strikers: Battle League Free Switch DLC Content Updates Include Characters - GameRevolution
Mario Strikers: Battle League Gets a Free Demo - IGN