You should look for as high an RTP as possible. NetEnt’s Mega Joker has offered an RTP of up to 99%, while Jackpot 6000 goes up to 98.8%, making them some of the best games for players. http://kajino.fun/dozenspins-casino-poland/
You should be presented with a payout table when you browse the games at the best online slots sites. http://kajino.fun/vulkan-vegas-casino/
It should tell you the symbol values, the special values and the paylines, while explaining the features and providing any relevant jackpot information.