Mario Strikers Battle League is getting its final free update in December, with the latest DLC introducing Birdo and Bowser Jr.
Mario Strikers Battle League has been updated to version 1.1.0 - My Nintendo News
Mario Strikers: Battle League second free update launches in September - adds Pauline, Diddy Kong, Barrel gear, and Planetoid stadium - Gematsu
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Mario Strikers: Battle League's First Free Update Will Bring Back Daisy
Mario Strikers: Battle League second free update launches in September - adds Pauline, Diddy Kong, Barrel gear, and Planetoid stadium - Gematsu
Mario Strikers: Battle League second free update launches in September - adds Pauline, Diddy Kong, Barrel gear, and Planetoid stadium - Gematsu
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Still waiting for the Mario Party Superstars update : r/Mario
Try Mario Strikers: Battle League for free with a new demo
Nintendo's Soccer Jam Mario Strikers: Battle League Is Too Fun to Flop - Paste Magazine