This part of IGN's Mario Strikers: Battle League wiki guide covers how to play multiplayer. There are a ton of options for online, wireless, and local
Online and Local Multiplayer Guide, multiplayer local
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How Multiplayer Works - Online and Local - Mario Strikers: Battle League Guide - IGN
How Multiplayer Works - Online and Local - Mario Strikers: Battle League Guide - IGN
Mario Strikers: Battle League - Super Mario Wiki, the Mario encyclopedia
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Mario Strikers: Battle League Guide - IGN