Cloak is the only item that will make you invisible to the naked eye. Any enemy not using xradar won't see you on their screen. If you do not use stealth simultaneously, then enemies WILL be able to see you on their radar, warning them of your presence. Turn both stealth and cloak on to become entirely invisible. Cloak and stealth will drain alot of energy. Cloak itself will automatically turn itself off when you fire any weapon, except for portals and rockets. It will only be available to very few ships. Some of them will have it enabled by default, and therefor cannot lose it due to damage. Other ships will have to collect greens to get the cloaking device. The cloaking device is one of the most potent weapons in the game. In combination with stealth, you can turn your ship into an invisible killer that will pound an enemy with your L3 bullets as you decloak, severely damaging / killing him while you cloak again, turning around for another strike. The element of surprise is usually enough to ensure a kill, or at least to damage him in a way that thor or bomb is enough to kill him. Timing is very important here, because he should not be able to dive behind a corner, or hide in a nearby safezone. Usually, your first attack is the one with the best chance of killing him. Sometimes it is wise to run away after a failed attack on someone, because he / she will try to retaliate. Find a new target instead, one that is not yet aware of your presence. Pursue your target, fly right behind him matching his speed and vector, and release a volley of bullets. If he doesn't die, simply cloak again and fly away a bit. Turn off your cloak and stealth when you're at a safe distance, recharge, and attack again. Your opponent will be aware of your presence now. If he has xradar, he will have switched it on. If he doesn't he might have dropped a portal to escape to when things get hot again. Turn on antiwarp to deny him the ability to use his portal, and charge again until he dies. In Warzone games, cloak is useful to sneak in an enemy base undetected, and suddenly have your entire team attach to you, taking the base by surprise. Ofcourse, after your team attaches they will be low on energy. To fix this, drop a portal, get out of the base again, and get your team to attach. When they are fully charged, warp back to your portal and imagine the look on the enemy's face if suddenly 8 people emerge in the middle of their base. When you are running away from someone that has xradar turned on, ALWAYS turn off cloak. It drains alot of energy, which you need to get away from him. If posible, leave on your stealth device. This way, the enemy chasing you will have to keep his xradar on. He will have less energy to spare, meaning that less bombs and bullets will be coming your way. And.... when you are not a cloaker yourself, remember to check xradar every now and then. It is quite humiliating to be killed by a spider like that. If you want to kill any spiders that try to kill you, simply fly around (xradar on) and watch any cloakers attempting to attack you. They will try to get right behind you, so drop a portal when one is close. Warp when he passes the portal, and nail him with your guns. Ofcourse, you shouldn't make any weird moves before that, since that will alert the cloaker that you know that he's there. He will then be more careful, and thus harder to kill.