Source: Sketch Nation
This is a fun little site that allows you or students to create a few types of games. Sketch Nation offers three templates for games: action, adventure, and puzzle. The site also offers three modes of game creation, simple, advanced, or expert to allow students of different skill levels the ability to create games.
Sketch Nation doesn’t require any accounts to use, and games that students create are automatically saved locally on their machine. This could be an issue when computers are shared among students, so that’s something to keep in mind.