Sending Gold

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But now the upgrades are nearly useless. The only time you will ever consider buying them is when focusing heavily on troops. But even then they may not provide good results. Once a tank gets freaky powerful no number of troops can stop it.

Thus you might want to add another bonus. Like every 6th upgrade releases an extra marine unit from every factory ( perhaps only your factories, not the allied ), every 10th an artillery and/or Zepeelin and every 12th a Firebat.