Sometimes source code is available - in recent summers, students integrated code supporting games such as [[Sfinx]], [[The Prince and the Coward]] and [[Avalanche]] into ScummVM. In fact, our support for the [[Wintermute]] engine was not only started by a GSoC student, who integrated the code into our tree, but also [[Wintermute/Games|drastically improved]] by another student a year later.
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A more challenging (but hopefully rewarding) idea is to start (or continue) reverse engineering a game where no source is available. Two good examples are the pair of students who drastically improved ResidualVM's support for Escape from Monkey Island, and the work on improving [[Operation Stealth]]. Another option is to work on merging someone else's reverse engineering work, such as was done with the [[ZVision]] engine.