Returning to Game Development

Since I have programmed my site I have been craving some more code to pass through these fingers. The joys of game making is being able to create multimedia experience but also the communities. Just as I have made lots of friends interested in biohacking and growing foods, I also have a bunch of great friends in game development. A site I love to use is Game Dev Underground made by my friend Tim Ruswick. I ache for a new project but I cant decide what to start working on I have a large idea that I'm not sure I am ready for or could even tackle alone. I was considering making a publishable piece for once, I want to finish something. I am considering an online multiplayer game that could go on my site or a mobile game. These both have their own stupid challenges and fun challenges. I want your opinion on which I should tackle.