Racketboy has a neat feature up called Together Retro Game Club: Sega Light Gun Games, in which the community explores a number of great light gun games for the Sega systems (Saturn and Dreamcast) with a few hits for the PC and Wii thrown in. It's a nice feature if you're interested in lightgun games.
Shooting Gallery is an add-on for the Magnavox Odyssey. It comes with four games, each with its own Überlay. Three of the games use the included game cart #9 and the fourth uses #10. The add-on comes in its own box with a GUN! A realistic looking rifle type of gun that plugs right into a socket built into the Odyssey! This gun is the kind of "non-orange" fake gun that will get you seriously killed if you "playfully" aim it at an officer of the law. So, uh, DON'T do that, 'kay kids?
In Prehistoric Safari, you USE the GUN! You are the MIGHTY HUNTER! However, you've lost most of your ammunition in the volcano (see it on the uberlay?) so you only have 15 shots. After 15 shots you'd better get back to your own world, using whatever method got you there (time machine, submarine or tiny raft). PlayerTwo is just the assistant, whom we always call "Jim". Jim's job is to move the target light behind each of the hideous beasts from before time. The Hunter should attempt to obliterate only the beast behind which the light is sitting. Jim keeps the light still until the Hunter takes the shot, and then, hit or miss, 'ol Jim moves the light behind another creature that should not be! The player's roles are reversed after 15 shots, and the person with the most "kills" after one round wins the game.