Electronics memory games like Simon can be a lot of fun. But it is even more fun if you add a second player and make it a competition. So I designed a two player version of the game that runs on Arduino. This lets you play Simon head to head.
To make it even more interesting, I added jacks that allow you to use external switches. This lets you use almost anything as a switch to play the sequence. All it has to do is connect the signal wire to ground. You can use large push button switches. You can hook up piezo vibration sensors to a drum set and play Simon with a drum set. You could even wire it up to the switches on a "Guitar Hero" style guitar. The choice is up to you.
Here is a video walkthrough of the project.