I have been playing this game about 4 or 5 days now. I am at 1,305 gems. I kept hitting bonuses and raising my bets. It got up to 353M in coins before I tried my hand at 4M/8M a spin in the high roller room. No bonuses, dropped 200M. But today alone, I went up 500 gems, and Sunday, I went up 400 gems. So in just two days, I was able to accumulate 900 gems. This game takes a LONG time to accumulate gems if you low-roll. I have not bought coins or anything, either. Just got pure lucky with this and raised my bets every jackpot to increase my bankroll. Now, I should NOT have gone to the high roller room, but I was on fire. My goal was to get 1.5k gems for a room in June. 2 nights would require 3.5k gems, and I know I would never reach that, even with my rate. I am currently level 35, reduced my bets to 40k a spin, and it is taking a long time to generate gems unless you're willing to bet high. I only do that to bonus-chase, then I settle down and auto-spin for 500. The mammoth game seems to be good to me, as well as the tree of gold game.