An SVG Pacman, scripted in JavaScript and PHP.
You can see it alive on SourceForge. Or, if it does not work (for instance, if I got a cross-site scripting attack again), you can use the front-end on GitHub.
At the time of writing this, it is also playable on a test VPS server of AdYou Cloud (it is an IPv6-only server, the simplest way to access it is probably to use TOR).