10 Hidden Video Game Details You Can Only Find Once A Year
7. Your Birthday - Metal Gear Solid 5
Metal Gear Solid 5 was a critically acclaimed entry into the historic Konami series, and the first of the mainline games to feature on the eigth generation of home consoles.
If the player decides to embark on for a spot of stealth-orientated action on their birthday they will receive an urgent message that they need to return to the Mother base.
At this point, it appears that Snake has been lured into some kind of ambush, as a cutscene shows Kojima's iconic character prepared to fight before he is joined by some of Diamond Dogs who offer their birthday congratulations.
Perhaps the most interesting thing about this easter egg is that the song sung by your comrades is not the Happy Birthday song that most people would instantly recognise. This is because the copyright status of the song has been historically contentious, meaning that developers run the risk of having to pay huge licencing fees just to include it in their games.