Micro - the Digital System Simulator (Lince)

As the title suggests, this is a simulator for digital circuits. 

You can put buttons and numbers for inputs, leds and displays for output, and a variety of chips in between for processing. Connect everything up and you have a circuit! What does it do? You decide!

And the best part, once you finish your design, you can save it and use it as a custom chip on other designs. So the complexity is potentially infinite!!

So, if you're a casual electronics geek like yours truly, I bet you can have a lot of fun.

Controls:

• Left mouse click to interact with components, you can toggle buttons, set numbers, open menus and create connections
• Right mouse click on the workspace to open the insert menu, on components opens the context menu
• Middle mouse drag to move the workspace
• Mouse wheel to zoom the workspace

Disclaimer: This is not really a game (yet), as in, there's not an objective or any in-game motivation to keep playing it.

Nevertheless, I already poured dozens of hours playing it, even in the prototype stage that it stands.