Welcome to Scissors Paper Stone: Alert!
What you need to do is win the guess, build your tank, and defeat your opponent.
The game itself may be boring, but the friends who play with you are the most precious.

Base -> build Barrack
Barrack -> build Factory, Infantry and Wall
Factory -> upgrade Infantry to Tank, and Tank to better Tanks!
Wall -> block one attack instance from opponent Tank
Tank -> attack your opponent.