Electrica is a puzzle/challenge site which has grown from two previous sites - C&C and the Cronos Crypto Challenge. You can register on the site and then compete against other puzzle solvers for points. The puzzles are a variety of mathematics, logic, programming, reverse engineering, cryptography and related problems. Problems start off easy but get harder as you get further in. At first you will only be able to see simple problems but as you progress harder problems will be available to you.

If you have registered here before, then please log in using the form below, and if this is your first time then please enter a username and password that you would like to use: