|While the Lynx did have a wide variety of developers writing software, most titles were ultimately released by Atari. This means there isn't a great variety in the types of cartridges released for the system. However, when Atari first started producing Lynx cartridges, they did go through two cartridge styles before settling on the curved lip that nearly all Lynx games ended up using. Atari's first attempt was a flat cartridge with no lip, just some dimples at the end of the cart. But these were not easily removed from the Lynx, so Atari then added ridges on the back of the cartridge. This made it considerably easier to remove the carts, but didn't allow for stacking at all (and it looked like a hack). Atari finally settled on the curved lip design that's most prevalent, which allows games to be removed easily while allowing the games to be stored a bit more easily (but not as easily as the original style used).
Cartridges in the first two styles produced by Atari are very uncommon, as Atari quickly switched all their titles to the curved lip design once they settled on it. Games created in recent years for the Lynx forego the expensive manufacturing process that Atari used and have been released using less expensive boards instead. These newer games typically have the chips and other components exposed, but work just as well as the sleeker carts produced by Atari.