The drill is pretty simple: you supervise a gold mine and the things got a little bit hectic there. Plenty of work, wagons full of gemstones, golden ingots and lots of trains rushing on the railways. To avoid an accident, keep an eye on the traffic. You will have the ability to stop the trains or to boost their speed with NOS. It may sound simple but it’s really challenging to maintain your focus on every railway. Best Gemstone Tycoon games.