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Command center have sniper upgrades.
There are 3 pillars to get different upgrades for gold or kills
Top Middle is to upgrade your economy related to food production from farms, power production from power plant and oil production from oil platforms.
Far right is sniper damage upgrades
Bottom right is sniper damage upgrades+90(Unlimited)
Middle pillar at the entrance:
Enable the first 5 options to enable endless mode. The first 5 options will respectively spawn 500 Executive, 500 harpies, 500 Venom, 100 Mutant.
DO NOT ENABLE the last option which is to spawn Giant
To defeat the last wave which is 1 Giant with HP50000000. DEF99%, KITE it.
I build stone towers on both side of the entrance and lure it to the right side of the entrance. As it destroys, continue to train snipers and build walls and towers behind the Giant. Get the Giant's attention to prevent it from entering housing area. Lured it back to the entrance while rebuilding towers and kiting. It took about 20 minutes of kitting and rebuilding to down the single Giant. The right side of towers filled with snipers killed the endless wave while kiting the Giant.