Blocks was originally designed by Simon Donkers (http://games.simondonkers.com/blocks/) and redesigned by Lazy Mutt Games to work on modern computers, and online.
In the game it is the goal to remove all the stones. To remove a stone it must be standing adjacent to a stone with the same color. When clicking on a stone, which is adjacent to a stone with the same color, all the stones with that color will be removed which are directly or indirectly, horizontally or vertically connected to the clicked stone.
You start with 100 point. For every stone you remove you get 1 point. For every 10 seconds it takes you it cost 1 point. Try to remove all the stones from the map in the best possible time. If you do not make a move for 5 seconds long a small graphical hint will appear pointing to a possible move.