Since I have not managed to find a sponsor for this package, I'm changing it to an RFP. Surprisingly, I actually got to the stage of making an git repo in pkg-gnustep for it. If you're interested in packaging this, the package in Alioth is in very good shape and may be a good starting point.
You can find the package here: https://anonscm.debian.org/cgit/pkg-gnustep/pkg-gmastermind.app.git
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