Bottle Opener

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Complete 250 Battle for Earth Duos

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These are the new T2 Duos introduced with DLC3, where you need to complete the Earth Duos 250 times. Now you can do these daily or you can keep on re-queuing up for the same Duo over and over again until you completed 250 of them total. These Duos are extremely easy and can even be solo by yourself. Below are the new Duos:

Brainiac themed Tier-2 Duos:

Riverfront Center
Gotham Hospital
Riverside Hotel

I recommend that you pick the one you're fastest at completing and do it about 25 times a day. It would only take you 4-5 minutes each run on average and if you do 25 a day, then it would take you 10 days to hit the 250 total mark.