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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I found it funny watching this 1person knocking it about the tower by himself/herself.. Moments like these you just have to smile at it :-)