The Ruby mine is a small, cone-tipped tower made of stone with a blue cone-shaped top and mine cart tracks running down into a tunnel next to the tower. The ruby mine is a once-in-a-lifetime special offer presented to low level players (below level 25). The offer is presented as one of the events below the castle, with the name "Ruby mine". The Ruby mine claims to have discovered a large amount of rubies below your castle, and offers to mine them for a one-time payment of 13200 rubies.
It will give 110 rubies every day for 360 days, totaling 39600 rubies, which is three times the original price. Of course, subtracting the original 13200 rubies paid, the profit is 26400 rubies. Essentially, it's a 200% bonus on 39600 rubies dragged out over a year.
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