If you want to make your own pinball game and leverage all of the features and maturity of the P3 machine... you can! No need to build a machine from the ground up. We've built the platform, and we've created all of the software tools and environments you need to successfully make your own game. In other words, we've done the hard part. You get to just fill in the same game we provide with all of the fun stuff!
There are a number of projects either in development or already released. The following have been announced publicly, and a few more are being developed in private:
Grand Slam Rally - Available at https://www.multimorphic.com/store/p3-game-kits/grand-slam-rally/
Hoopin' It Up - Available at https://www.multimorphic.com/store/p3-game-kits/hoopin-it-up/
Quest For Glory - https://pinside.com/pinball/forum/topic/p3-game-so-you-want-to-be-a-hero-quest-for-glory-pinball
Ranger in the Ruins - https://pinside.com/pinball/forum/topic/p3-game-ranger-in-the-ruins
We just released v0.5 of our development kit. It's available on our support site at https://www.multimorphic.com/support (account required).
Please let us know if you have any questions or want to start your own project!
Note - this dev kit is not for fully custom game development using the P-ROC or P3-ROC boards. For those, most people use SkeletonGame or MPF.