Strat-O-Matic Baseball 365

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First thing to do is decide what league you want to join. Then create a team with the appropriate settings, and the last part of the process will be to join the league (it's easy once you get started.)

List of open leagues:
https://365.strat-o-matic.com/league/list

Start a new team:
https://365.strat-o-matic.com/member/startnewteam

If you are referring to the daily game, it does not come out until the season has started