Coleco released some of the best arcade classics, though the quality of play and graphics is something to be desired. The Colecovision versions of some of the same games that were released for the 2600 are much, much better. The two key rare games by Coleco are Berenstain Bears and Smurfs Saves the Day. Both of these use a tape player called the Kid Vid to load games from a cassette, but they also have a cartridge. Variations with Coleco also include mold variations which are explained in the link below.