Oh gotcha, that was what I figured but it did throw me for a loop at first. Maybe have it so they only appear there once you unlock them?
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That may be a good idea, or at least saying something like the heroes are for trial only in the training room. Our original thought was to show all available heroes in this game to the players, in case we didn't introduce the heroes well, so at least let the players know they exist lol. Once you defeat a boss and save a hero, you should see a new hero in Home, just like what you suggested.