Portal

A portal is shown by a set of concentric circles on the left side. The portal is used by pressing Shift+Insert and can only be used if there is no antiwarp on you. Once you lay a portal, you can leave the portal and go anywhere on the map. The time that the portal stays in existence is on the right side, next to the concentric circles symbol. If your time hasn't expired, you can warp to where you placed the portal by pressing Insert with no loss of energy! This is useful for basing, since you can place a portal, fall back, and then warp to the portal behind enemy lines (this is why you should ALWAYS have anti-warp on in a base). In center, you can place a portal, let an enemy follow you, and then suddenly use the portal and attack them from behind.