Before Simon had electronics, he had rocks. That's my story, and I'm sticking with it. It's a bit ingenious, and whole lot igneous. Ouch! That was bad, but there's more where that came from.
So now 21st Century gamers like you can click fancy rocks on their modern digital device. Click start, tap a rock, and memorize the magical piano-like notes they make. Play them back in order and rack up the points. It's sedimentary, my dear Watson!
The better you do, the faster it goes.
Have fun, and enjoy SIMON 10,000 B.C. !