You only get one grid full of blocks so you must plan and click carefully to create as big of a match as possible. To remove a group of blocks just click on a group of 3 or more of the same color, the blocks will collapse and move towards the middle. The scoring works like this, the first two blocks are worth 15 points each and every block added after that gets 10 points on top of the previous blocks value. A group of 3 blocks equals 55 points. A group of 4 blocks equals 90 points. A group of 5 blocks equals 135 points. As you can see its better to make as large a group as possible, so take your time and plan it out.