This is a great project, both graphically and gameplay-wise.
There's also a lot of attention to detail, especially for a calculator game.

Is this project still alive? And if not, is the source code available?

(For those willing ty try it, I'd reccommend playing it on an emulator, as there doesn't seem to be a way to quit the game apart from dying (which is sometimes impossible when you get stuck).

@ben_g: Revsoft would probably be the best place to ask since that is the projects home. The original author has long been gone, but I think some of Revsoft staff might have kept in touch with him (maybe)?

That's wonderful news!

To me this link provides the most information: http://wabbit.codeplex.com/SourceControl/list/changesets
But It only shows that the Zelda map editor is being worked on earlier this year.