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App Support - At the bottom of screenshot click "App Support".
Please check gameplay videos.
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-----1.1 Version Additions------
1. T-105 model can be free.
2. The addition of technology.
3. Adding Command Center attacks.
4. Add the ability to upgrade the damage of turrets.
5. Adding buried land mines.

There are many things need to keep with in this world.
However, most of them choose to run away instead of to face and prevent the attack to protect themselves.
I, the developer of this game, do the same.
Future is not foreseeable in the reality, you can still try your best in this game.