Voidborders
Voidborders is the sequel to Map 2. As the final entry in the Map series, it’s an odd one at that - it’s the only one to feature an actual non-ironic map, at least partially.
The first part of the map presents a legitimate story about a criminal escaping prison and going on an adventure to find the Voidborders, a legendary realm found underneath the void. This dimension doesn’t actually appear within the map, although it is shown and expanded upon in Focused Location 2.
The second part, much shorter than the first, is a segment very similar to the first two entries in the Map series, with exposed redstone, constant fourth-wall breaking, and ending with a fight against Je22. The second part isn’t really related to the first one - story-wise, the first part is supposed to be a beta version of a map that was being built in Map 2, and the second part is the behind-the-scenes redstone area of that map.
The first part also contains a pretty extensive reference to the puzzle game Portal 2, including a trip into a parody version of Aperture Labs called Aperture Lemon Innovators.
Like Map 2, Voidborders doesn’t expand much on the SpakeMiner universe lore. It does introduce one character, Caroline the Witch (simply named “Witch” in this map), who makes an appearance later in Focused Location 3.