Mass Effect 3 contains a hidden Mars rover Easter egg - and now, 10 years later, there's an "official" map showing how to activate it for yourself.
Writing on the Mass Effect reddit, former BioWare designer Richard Boisvert explained the Easter egg was his creation, and there was a specific path players had to follow in order to see it properly.
"As far as I know no one ever stumbled upon it," Boisvert wrote.