For collectors only.
I grabbed this module because I was feeling nostalgic of D&D BECMI edition and wanted a solo game. I had just played the solo scenario that is part of the Basic (red) player's guide and was expecting something deeper and longer. To be completly honest, you will have a lot more fun playing a Choose Your Own Adventure book!
It's extremely short. You can die after reading 3 paragraphs or reach the end after reading 20ish paragraphs. The map is so simple it doesn't really require you to draw one.
It is meant for a Thief of level 1 to 3. Made the wrong choice? 3 damage! That kills most Thief level 1. Lock picking, stealth, detect traps and such abilities are not even resolved using % rolls, but by picking "invisible" numbers (that were originally revealed with the magic pen).
I'm giving 2 stars because there is at least a section at the end of the module to run this mini-dungeon multi-player. Could fill a game night.