Sega struck gold with Sonic the Hedgehog for the Sega Genesis in 1991, so when the time came to release the sequel a year later on so-called "Sonic 2sday", the company's American division worked to come up with ways to make the new game stand apart from the others around it. One of the ideas they came up with and took to the prototype stage was a hologram cartridge label. As shared on Twitter by Sega of America's former Director of Marketing, Al Nilsen, the labels were visually appealing, but went unused due to the added expense of manufacturing them for each cartridge.
Sonic 2 hologram cartridge label prototypes. We didn't use them. Too $$$$, but very cool pic.twitter.com/RA4hoV7ITY— Al Nilsen (@AlNilsen) July 1, 2014
The hologram didn't go completely to waste though. A few months after dismissing the labels, Video Games and Computer Entertainment came to Sega with the idea of featuring a Sonic 2 hologram on the cover of the magazine. The hologram ultimately appeared as part of the October 1992 issue. It's a very eye-catching design and would have turned a lot of heads, but Sega made the right call by not using it for the cartridge labels. Considering the added costs, I don't see how it would have increased sales by a significant amount. Who is on the fence about buying a video game and then decides that the label is the factor to make it a worthwhile purchase?