Metal Gear Solid V: The Phantom Pain is receiving rave reviews. There is an Easter egg that is sure to make you smile.

According to Polygon, if you are playing the game on your birthday, you will receive a special and urgent message from Mother Base. When you get to Mother Base, Ocelot, Miller and soldiers will bring out a cake and sing "Happy Birthday To You." (It's not the original lyrics, but you will get the message.)

You can check out the video of the Easter egg below:

Could there be more Easter eggs in the game? According to Polygon, there is a P.T. Easter egg.

For those who are not familiar, P.T. was a game that was going to be developed by MGS creator Hideo Kojima and Hollywood director Guillermo del Toro but was canceled at the last minute due to Kojima leaving Konami. The demo is considered to be one of the scariest things you will ever play.

Metal Gear Solid V: The Phantom Pain has received rave reviews, with video gaming websites such as IGN and Gamespot giving it perfect scores. This is the last Metal Gear Solid that will be made by Kojima. It is easily a candidate for Game of the Year.

According to Destructoid, an important chapter was cut from the game. You can only watch the scene in the special edition of the game.

It is unknown if Konami will make another Metal Gear Soild game without Kojima. Kojima and Konami's relationship has been cold since Kojima decided to leave the company earlier this year.

Metal Gear Solid V: The Phantom Pain is in stores now for the PlayStation 4, PlayStation 3, Xbox One and Xbox 360.