Atari Age user enthusi is working on a new homebrew game for the Atari 2600 - Assembloids.  You can find the original thread here:  New Game: Assembloids 2600

Here is an excerpt from his post:

It is a fast paced reaction puzzler in 4k for the wonderful Atari 2600.  Restricting myself to 4k was very important to me, since I consider it the original spirit of the machine and indeed, I am now increasingly nervous about the ROM size limit and fight for concepts and bytes already. Some space is left, but sound fx and a few other things are still missing as well.  I am very confident, however, that it will see the light soonish.

Your screen shows 5 windows. One central and one in each of the four neighboring sides.  A quarter of a face in a particular color is given in the central window and you can place it via joystick up, right, down, left if the corresponding tile is still empty - otherwise you're losing one of your precious lives. During all that the timer bar
decreases faster and faster...

Once a full face is complete, the window is cleared again and you score points.  The amount of points depends on the colors as you probably have guessed by now.  A full face of the same color gains you 300 points.
Having 3 face parts in the same color, still results in 100 points.  Only 2 parts of equal color give 40 points and a fully mixed face a mere 10 points.  In case you were able to clear ALL windows, a whopping extra 500 points and an extra life are added as well![/font:26qo3rba]

 
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Posted with permission from enthusi.[/align:26qo3rba]