Experience points

So whats that green bar doing on my screen and whats with the big green number?

Whats a game without a little bit of self improvement? In Minecraft you are rewarded for every kill you make and for almost every block you break. This is shown on the green bar right above your hotbar and right below your health bar. The green number shows just how many points you have. Unlike other games where you level up and become stronger, here, your experience points are used as a virtual currency to pay for enchanting your armor, weapons and tools.