To unlock Co-op and Vs. modes you'll need to start with Adventure mode and get all the way through level 2-5. After this level, Co-op and Vs. will automatically be unlocked. On the main menu screen ...
Knockout originally started with only one mode and map, before adding a second one called 2 Teams. Don't be surprised if more modes and maps are later added with new updates. Before each match starts, ...
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