Rocket jumping It is a good choice to use ultima cannon to rocketjump around the map. It is possible to obtain the uberhealth by rocketjumping. For those players who are lousy players,they can rocketjump onto one of the bunkers and try to shoot at enemies. Hopefully they will not notice you and you can continue shooting.
The Underground contains many credit items that cannot be acquired with points such as armoured gear and powerful weapons. Also, it is possible to purchase many level locked weapons at lower levels of XP.
Also, clan licenses are available for points.