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Black and White
The original black and white games are distinguished by their black cases. These are playable on any console variation.
Color
Color games came in clear cases. Most of them had the Wonderswan Color logo, and had a "C" after the 3 character company code in the cart number. The exceptions to this are Hataraku Chocobo, Dicing Knight, and Judgement Silversword. Color games are playable on any color or crystal console.
Backwards Compatible Color
A small amount of color games are backwards compatible. Here you can see Hataraku Chocobo, a color game hiding in a black case. The later consoles increased the amount of memory on board. Games that utilized this, most of them, are not compatible with the original black and white consoles.
Crystal
Games released after the crystal are marked on the box as such. These also come in clear cases, and are compatible with the color consoles. Some games are marked with the same SwanCrystal/WSC identifiers on the cart as the box.
Misc
There were a number of peripherals released over the Wonderswan's lifetime. Some of these came with special cartridges that were needed.
Tenori-Oh
An unlicensed limited release. This is a software music sequencer that was sold at a convention. Only about 100 were made. A few years later, Yamaha released a hardware version of it.