With all the fun mining games out there, this one just doesn’t cut it. I’ve had it installed less than 24 hours, have 1-2 hours of gameplay, and I’ve completed all the challenges. I’m also at the highest level. The gameplay is very basic. You can upgrade the oil aka fuel tank (how long the drill will run), the pipe aka shaft (how deep you can drill), and the offline earnings rate. After you reach a depth of 500m, the bonus items stop populating. Also, you can’t control where the drill goes after selecting one of three starting spots. I’d say this game is fun at first, but that’s just because I thought I could get drill bits that drilled faster, or maybe bombs, maybe there’d be obstacles, but as you progress, the game doesn’t really change and it doesn’t get any harder. This game is not worth your time.