The object of the game is to form vertical or horizontal lines of three or more identical gems.

You do this by clicking on two adjacent gems, which will swap positions.

Two adjacent gems may be swapped only if one or both of them then form a line of three or more identical gems.

The line then disappears and the gems above fall down to take their place.

Each line you make scores points and adds time to the clock. Longer lines score higher, cascades of multiple lines score a lot higher!

Each time you manage to beat the clock by pushing it to the maximum you earn a bonus multiplier (which increases the amount you get for each line) and the game speeds up.

If there is no way to make a line, the current set of gems will be replaced with a brand new set of gems.

If you don't make a move for twenty seconds the game will try to give you a hint by highlighting a gem you can move.

You can also play in Free Play mode where there is no timer, no bonus multipliers, and the game ends when you can make no more moves.

And, should you need to take a break, there is even a pause button.