Alright, I took my "old" Metris project and refactored the code.

It's called Rubytris now, and it lives on GitHub, so you can easily clone the repository and checkout the code with:
git://github.com/lobo-tuerto/rubytris.git

Or just visit the project's page here:
http://github.com/lobo-tuerto/rubytris/tree/master

Refactoring brought:
* The one-long file has been broken into various files, it's been translated to English (comments & in-game text).
* Decoupled a lot of methods (will keep working on this next weekend).
* Simplified a lot of methods, easier to understand now.
* Some ideas and planned features.

Any comments will be appreciated! :)

Nice =) I didnt see the old one so I dunno how profound the changes are, but even if the game itself is exactly the same, refactoring is always a good idea.

Yup, refactoring is your friend! :)

It keeps, the code readable and maintainable.
I think I will declare the Rubytris done by now.

I'm getting into an interesting project:
http://www.libgosu.org/cgi-bin/mwf/topic_show.pl?tid=191