I really enjoy this game. The point is to meet certain challenges using fundamental components like logic gates and multiplexers. For instance one challenge requires you to add two 3 bit numbers together (a basic calculator). My knowledge of logic gates is limited to a few homework problems but I picked up this game relatively quickly. Its exciting to figure out the challenges because it gives insight into how very basic functions can be carried out with only a few components. The interface is pretty good, although I think there could be some improvements on small things like navigating between levels (which requires a number of steps currently).
Doodus about Circuit Coder