This game gets the award for most annoying computer. Hard mode be like, 'Oh, you're attacking me? You can take it, I'll just withdraw all my units. Also, I took two of your planets while you weren't looking.'
If you put all of your guns ONLY in the very back of the 3rd class or higher, and during the game, you keep your mouse towards the inside of the circle, you can use the boundaries of the field to protect you from bullets while you work out a strategy or recharge your secondary.
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If you have very slow internet, otherwise not..