10 MORE Video Game Secrets That Took YEARS To Find

10. Developer Credits - Donkey Kong

Here it is, one of the earliest known Easter eggs in gaming (if not the outright first). The reveal of a secret hidden in the Atari 800 port of seminal Nintendo hit Donkey Kong may seem underwhelming today, but speaks to a bygone era of gaming worlds apart from what we have today.

Programmer Landon Dyer had designed the port almost entirely by himself, with no support, existing code and little hope for a licencing deal. Because of this, he opted to hide a little secret in the game's code - something that wasn't known until he revealed it himself 26 years later.

After the code was picked apart and the secret's conditions revealed, including reaching a very specific high score, losing all remaining lives in a certain way, setting a particular game difficulty and sitting through the demo screen, the Easter egg was finally revealed:

The letters "LMD" would appear near the bottom of the title screen. A little disappointing these days, when Easter eggs can be anything from playable characters to entire hidden missions, but considering the limitation of memory on such early platforms and the lack of credit developers were afforded at the time, you can't expect much more.