Well, once I have the following games, I will have all R4 Atari 2600 games*.

* I don't count Sears, Froggo, Zellers, and other companies who just put out the same game and title it differently.

+Buck Rogers: Planet of Zoom (Sega)

+Bump & Jump (M Network)

+Cosmic Creeps (Telesys)

+Defender 2/Stargate (Atari)

+Fathom (Imagic)

+Firefly (Mythicon) - I'm only counting this game after learning the other two are hacks of the first one.

+Flash Gordon

+Front Line (Coleco)

+Glacier Patrol (Telegames)

+Krull

+M.A.D.

+Masters of the Universe - He-Man

+Mogul Maniac (Apollo)

+Moonsweeper (Imagic)

+Racquetball

+Solar Storm

+Spitfire Attack

+Subscan

+Survival Run

+Taz

+Thunderground

+Title Match Pro Wrestling

+Tomcat F14 Flight Simulator

+Tunnel Runner

+Wabbit

As you can see, I have quite a long ways to go. I also want to get myself a X-mas present from the AA Store, but i don't know what will come out by then. I got Sprintmaster and Desert Falcon in the mail yesterday, bumping my total # of 2600 games to 235.