Making a Puyo Puyo style puzzle game

[Zuare]

I'm trying to make a puzzle game like the Puyo Puyo games.
(If you don't know what it is, you can play it on this site.)
I've made the blocks that you can rotate and fall down the screen.
The only problem I'm having is, how can I make the game know that 4 blocks of the same color are connected?

[Hernan]

Hey, I'm making a Puyo game currently too :P
There are 2 options:
1. You code it yourself using an array to store the puyo locations and loop throuhg the array.
2. You use the Advanced Game Board Object, which has this function built in.

I have tried both methods. I can assure you that coding it yourself in MMF is quite complex. (I used loop recursions to emulate a "while" loop, crazy stuff )
Eventually, I rewrote my engine and used the AGBO, because I was to lazy to redo that part :P