As development progressed, some of the caverns originally planned for inclusion were deemed to be impossible to add to the existing framework, or found to be unsatisfactory during playtesting. We'd already compromised on some of the Bob McFarlane levels, reproducing them as best we could, but losing some of their unique features. Some of the caverns which hadn't made it into the official SAM releases of Manic Miner had to be rejected outright (with tentative plans to include them in some form in a later game) because there was no way to achieve their intent within the existing cavern structure code, even with the updates and rewrites. This led to a shortfall in the number of caverns available to add, which led to members of the development team being asked to provide some new layouts. Since there was no set number required by each of us I just let myself go wild and put together as many layouts as I could dream up. I ended up providing four unique caverns for The Lower Cavern...