Just found the soccer ball in the tower outside the left green hall entrance, This is going to spawn mini games with tower players if this is in the full game. For those curious where its at, it's near some crates near the green side staircase to the overlook of the Tower entrance. Have fun!
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The ball can be in one of three locatins by the two crate piles were you found them both piles spawn a ball and the third is behind the message guys building very close to the other 2 if the ball gets stuck or lost wait a minute and check theses locations for a new one