While working on a NES port of side-scrolling arcade shooter Gradius in 1986, developer Kazuhisa Hashimoto decided to make his testing sessions a little more, well, interesting by creating a cheat code.

That cheat code (otherwise known as the "Konami Code") was Up, Up, Down, Down, Left, Right, Left, Right, B, and A.

Hashimoto forgot to remove the cheat code before Gradius was released, though. Naturally, eagle-eyed players found the code and began to share it.

The Konami Code is now present in numerous games (like PS2 hit Metal Gear Solid 3: Snake Eater) and various websites (such as Facebook).

It's 'hidden' in some smartphone and tablet apps, too. This includes the Google Play Games app, which The Big G released on Android just yesterday.

Swipe up twice, down twice, and then left, right, left, right on your device's screen, and you'll be presented with some virtual buttons on which you can tap out the rest of the code.

So, what happens after you enter this magical code on your 'droid device? Well, you unlock a secret achievement called "All your game are belong to us".

Worth it, right?