Nintendo games often have little nods to other franchises cheekily tucked away in hard-to-reach areas, giving fans a nice little burst of happiness and pride when they stumble across them, but this little easter egg inside Donkey Kong Country: Tropical Freeze managed to remain hidden for more than four years. Until now, of course.

Shared by Shane Marchis on Twitter, the image below shows the spot where a lone Metroid can be found, casually swimming in the background minding its own business for a change. Of course, with Retro Studios being the developer behind both Tropical Freeze, and the Metroid Prime series, this is a lovely little crossover moment that teases the idea of the two worlds somehow being connected.

If you're wondering how no one has stumbled across this before, you might want to give the video below a quick watch. As explained by the folks over at GameXplain, the Metroid can be found in level 4-3 Amiss Abyss, heading past the first checkpoint until you reach the illuminated underwater area. From here, you have to swim forwards out of that area, before returning back again - taking damage along the way - to watch the Metroid float up from the bottom of the screen. The Metroid can be found in both the Switch and Wii U versions of the game.

Will you be booting up your copy of the game to try this out?

[via twitter.com, youtube.com]