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The Crystal Mine is a building that helps you give crystals, the main currency of the game. It is important to keep these up, as they fuel your base. You receive 2 at the beginning of the game and cost 0 crystals to build.

Tips

  • Always place as many crystal miners as you have, and max them out as fast as possible in order to level up your base quickly.
  • Keep strong defenses near your crystal miners, as crystals are necessary to upgrade your Base.
  • They are your most important building behind your Base.
  • These are your top priority when upgrading. Always keep these the same level as your Base for high income flow.
  • Upgrade these 2-3 levels higher than the rest of your base to increase Crystal income.
  • Don't place crystal mines near one layer walls, as suicide bomber zombies can easily destroy them.

Characteristics at different levels

Level 1 2 3 4 5 6 7 8 9 10
Health 500 600 900 1000 1500 2000 3000 4000 5500 7000
Produce/s 3.5 5.5 8.7 14 22 36 50 90 150 200
Upgrade 90 120 210 360 4000 6000 -
Cost 0 150 650 2150 5150 9150 15150
Sell for 0 90 390 1290 3090 5490 9090

[1] Original reference

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