Over 10 million users downloaded Android version of the Hills of Steel game. I could notice that more coins can be made only in 1 vs 1 multiplayer. Other playing options like Boss Rush and arcades (midsummer siege, winter war, desert assault and others) give exciting experience by shooting all kinds of vehicles, helicopters and planes, although providing few chances for getting much more coins.
Small tanks are the strongest
For easy and simple handling small tanks are the best. One may earn coins faster and can upgrade their specs swiftly. Thus, you can collect enough coins to buy bigger tanks for different experience. Only strength of big tanks is their guns. By one shot you can defeat helicopters and small tanks in arcade modes.
For faster upgrades spending real money is the main option. However, you may lose interest in the game quickly as you get strong tanks by upgrading. Paying for non-ads platform is the smartest way to play this game since ads by Google are disruptive.
Most users play 1 vs 1 when they are ripped off by hardness of the arcades, especially Desert Assault. Its helicopters cause major destruction to their tanks. Upgrades do not work here since only tactical gaming skills are must have. Even tactics are insufficient as you reach new stages of any arcade.
Crowded Tank Place
In arcade modes, one can easily destroy tank crowd by standing far and applying repetitive shooting. Even that chance earned me fewer coins than 1 vs 1 gave me. Remember, you will play against bots in arcades. Multiplayer is way more interesting because you play with real players online.
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