I managed to get a couple of other PhD students at my university interested in Mouse Maze - they've been running variations on my genetic algorithm method and Andy's gotten his score up to 34,188, which is fairly impressive. My best is only 20,158. (Tomf did fix the 200 visits bug; first he just pushed the limit up to 1000, which we then proceeded to achieve, but I think he's fixed it properly now.)
Need to get around to beating Andy sometime, I think it's mostly just a matter of CPU time spent, but more important right now is Vertex Dispenser. I've been saying for a while that I only needed to spend a few days focused on it to get things like the multiplayer working properly, and now I am trying to do just that. So far I've managed to get the netcode back into the state it was a year or so ago - so it basically works, isn't jerking about wildly and constantly throwing error messages, but will probably get out of sync occasionally still. Plus there are going to be problems with sounds that get started, turn out not to have ever happened, and never end up being stopped. Still, progress!