TLDR: Real or fake? Sometimes it is difficult to spot fake Game Boy games. See the complete guide here: https://www.kleemans.ch/static/fake-gameboy-games
I started collecting Game Boy games around 3 years ago, when I got into old Game Boy games (and later also into refurbishing old Game Boys).
After buying a game and finding out pretty quickly that it was fake, I did quite some research and found some helpful videos and blog posts, with a lot of information. I started to collect and aggregate information, until I realized that only with good example images I would be able to actually use and remember it in the future (and maybe it could be even helpful for others?)
That was the point I decided to put together a guide myself, with as many examples with images I could possibly find.
I wrote to all the people I bought Game Boy games from in the last year, and immediately got replies coming in, and some days and weeks later also post packages. I ended up with a big box of fake games, reproductions, counterfeits and cheap copies.
With everything available, I started to make photos, and collecting and creating categories for possible signs when a game is real or not. I ended up with the following categories:
There were also two special cases, China releases (which turned out to be real after all!) and label replacements, with authentic game cartridges but label reproductions.
I put some effort into making the images zoomable. There are two types of zoomable images:
Single zoom images: Zoom in on a single image, within a fixed "frame" (original embedded size of the image).
Parallel zoomable images: These are especially helpful when I had both the fake and the original it intended to copy, so you can see exactly what the difference is.
Overall it was a nice experience writing some pure JS/HTML again, as opposed to most of the Angular/TypeScript stuff I'm doing nowadays :-)
Please see the complete guide here: https://www.kleemans.ch/static/fake-gameboy-games
Thanks for reading and good luck spotting fake games!