With varying degrees of risk & reward, these games are suitable for both low-rollers and high rollers. The fundamentals of the game, familiarity with the various slot machine varieties, and share it app downloadknowledge of the possibility of large wins and entertainment value are all necessary for players to fully comprehend real slots online. Rules and Licensing. A trustworthy online casino will have a license from an established gaming regulator, like the UK Gambling Commission or the Malta Gaming Authority, to guarantee that it follows industry standards and stays within the law.