This exercise is all about key sequence detection. Basically when someone inputs a certain sequence of keys into a window or input, something should happen.
This is a.k.a the Konami Code. It is a cheat code that appears in many Konami video games and even buzzfeed uses it on their website. If you press Up, Up, Down, Down, Left, Right, Left, Right, B, A, Enter. It changes the background. A lot of websites have these types of easter eggs.
Haha, this is quite fun! Everytime you type the secret code ‘milad’. Unicorns will be printed to the screen XD!