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Welcome to One Gram Software by Russell Sasamori. This site specializes in Maze, Puzzle and Electrical Engineering Software for Android and Windows. Some are free, some are for purchase, and some run on-line.

Android Apps
I can design a counter 3.1
I can deign a counter Teaches electrical engineering students binary counter design. Comes with Wizard, Bubble Diagram editor, Finite State Machine Simulator, State Transition Table, Boolean Expressions Generator, and Circuit Renderer.  Buy from Google Play.
Get it on Google Play
20 Hops Puzzle
20 Hops A variant of the so-called Knight's Tour puzzle. You must visit every tile exactly once using the movement of the Chess Knight.
Buy or get it for free from Google Play.
Get it on Google Play