For Ludum Dare 41, A game jam competition where you have 48 hours to create a game from start to finish. I created a small horror game. This game is far from complete, but I really liked the experience as I had to inject myself into the game creation process.
I gained more experience in sound design as well as art creation. Making a game requires all of these elements to be made, and having this small of a timespan really lets you dive in the deep. Therefore I learned a lot from this experience.