This hidden underground lab leaflet/pamphlet adventure for FIST packs a lot into 2 sides of a page. There's a crafting system, enemies, and (fairly gore-y) things to discover in the facility. Your objective is clear, but there are a few different ways to achieve it, leaving freedom for the players and referee to explore and create their own take on how to resolve it. The layout and style are clear, on-theme and easy to follow.
The scenario does use d4s and d8s but I'd have loved to have seen if you could have achieved the same goals sticking to the simplicity of just d6's. That's very much a personal preference though!