Johnson's* wit has never been in doubt (anybody who has ever played "Aunts and Butlers" can testify to that) but here he's chosen another topic ripe for satire, that 35 year old Infocom adventure classic Zork.
From that oh-so familiar cover to the charming simple illustrations dotted throughout, it's a wry look at some classic fantasy tropes, and I genuinely laughed out loud on more than one occasion. It's a rare game indeed where even the 'game over' screen raises a smile. It's also running under an excellent parser and I only struggled over the puzzles, not how to word their solution. Top notch all round, and thoroughly recommended.
* - As an aside, isn't it odd how it's acceptable to refer to somebody by their surname when you're reviewing their work. I'd never dream of calling him Johnson to his face.