The big runs are scored by hitting the ball into the bleachers (like a home run out of the park).

This is achieved via the ramps.

Getting the ball into 'left field', 'right field' and 'centre field' scores 20 runs.

This is carried over from player to player.

So if the first player scores centre and left field, that leaves the second player able to steal the 20 runs via hitting the right field bleacher.

Not as easy as it all sounds.