I noticed the DP guide missed listing the Beeshu "Zipper" in the Non-cartridge section for the NES. These (I believe) are more common than the ones you do have listed. There are several versions of it as well. The "standard" grey with red buttons, and a blue one with multi-colored buttons are the ones I have personally come across, but I believe there *may* be a red one as well? Not sure on that last one.