Explore the deep mines beneath CheckiO! Help Nicola build a set of pipes for the Pumping Station and invent a calculator that changes the very laws of mathematics! Can you dig it?

Mine

The station you are trying to open is now closed, but there are several ways which will allow you to open it.

Authorize

In order to get the maximum of the game, you should login. During this process you can use your social accounts such as FaceBook, Twitter, G+, Github, StackOverflow, etc.