Made by casual games giant PopCap, the odds are you'll have played - or at least heard of - Zuma, or come across one of the many similar titles. Seeing you playing as a little frog who can shoot different coloured marbles out of his mouth, it's up to you spin around on the spot, in order to fire the marbles at a snake made out of coloured balls, which slowly trundles towards the exit. Matching three or more of the same colour makes the marbles disappear, which earns you points, and temporarily halts the snake's progress.
While simple to get your head round, thanks to the ever-present aiming line that shows exactly where your marble will go, younger children may not have fast enough reactions or precise enough motor skills to make the matches needed to complete the levels, as you have to use the analogue stick to aim your frog, with fairly minor nudges having a fairly large effect on where you're aiming. That said, if your kid enjoys any of the similar games, like Actionloop, Luxor or Magnetica then the odds are they'll cope with and enjoy Zuma's Revenge too.
As a game that involves a stone frog spitting coloured balls at a snake of other coloured balls, there's nothing here for parents to be concerned about. Nothing in the way of blood, bad language or sex.