Few ideas:
1. Special Weapons that can only be used by playing this event
2. Support items (players purchase support items with coins such as a graalian dummy to distract the robots and make them think its an actual graalian. kinda like the monkey in cod zombies)
3. In order to play the game u need a Survival Token. they can be obtained by doing missions
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If they did zombies like cod with leader boards, I would play zone a lot more :p
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^^^