One
99.9% of your opponents are nothing but bots that the game creates to hinder your progress. The contents of the treasure chests are not random, and almost all times you will get what you don't need. After every one-minute game, there is a commercial. There are also very long and unstoppable advertisements if you chose to watch an advertisement so that you might win 'randomly' (and of course in the end you won't). In general, the game is nice, but completely unfair, biased.