Announced for preview at 18th June at RetCon 2019 and for release on Sam Revival cover disk. Updates also appeared at subsequent RetCon events, including a high score competition at the 2023 event.
Per the original MM conversion, the game uses a palette of just 12 colours, with the remaining 4 set aside for palette cycling, taking the place of traditionally animated conveyors, etc
Palette switching used sparingly to allow a more unique feel to some caverns
New and unique title screen image, and each set of 20 caverns has a unique 'topper' for the final cavern
Reinstates Eugene, such that "The Sugar Factory" cavern is back to being "Eugene's Lair", though the Eugene sprite is new and unique to The Lower Caverns
Replaces the 'solar death beam' game over screen with the more traditional 'boot crush'
Player sprite now has 8 frames of animation
Many of the enemy sprites now come in multiple colour variations
Most of the graphic design was done in SAMPaint running under SimCoupe, with some elements created in Adobe Photoshop and transferred via SCADM
Dedicated custom font for cavern names
Originally planned to be 256K compatible, but the additional graphical content necessitated development as 512K-only
Bob McFarlane's remixed caverns are included, but some features are absent or cut down, according to the limitations of the SAM game engine
One of Phil Wilson's proposed caverns proved impossible to implement, but the idea is now on the 'To Do' list for another game
Published by SAM Revival magazine, but officially an Entropy product
The Lower Caverns logo was created in Adobe Illustrator, but the original files were lost in an external HD crash in 2020