I filled in the fourth square of that map. I had to work in a small space, so my addition isn't much.
Here it the final map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
Who needs a name? AB00Z00Z00Z00Z00Z00Z00Z3034150ZAB334113131210Z10Z9234200Z00Z00Z2024152341A0333213122210Z4021210Z00Z00Z00Z2021222ZA033231311324022210Z10Z00Z5134100Z00Z22Z00Z00Z80Z6011240232603126031200Z00Z00Z2334122Z00ZA06011260312603126031200Z532413324Z34122ZAB01132011320113210Z0234100Z631124134252Z00ZB11320113240Z0113210Z0134100Z203417121210121A00113201132011320113210Z2234100Z2034Z34140132C0050341333Z0Z10Z10Z10Z2234100Z0034Z34110121AB10Z10Z4012210Z00Z00Z00Z1134112ZB1341C0010Z10Z10Z10Z23342233421134Z341
Terra Subterranea 30412C0010Z5Z2AB00Y12Z12Z12Z1292112C0010ZC0010Z10Z10Z10Z6Z16Z16Y112Z12C0010ZACZ00Z10Z00Z7311200Y1250112C0010ZC0010Z00Z10Z10Z00Y1200Y1203112C0010ZC0010ZC0010Z00Z00Z00Z00Y1203112AB10ZACZ00Z80Z10Z50Z13112C0010Z10Z10Z00Z00Z10Z10Z10Z10Z00Z1311213112C0040Z00Z10Z10Z00Z00Z00Z0211200Z1211203Z13Z13Z13Z10Z701212311223112231122311202ZA013ZC002Z210Z10Z10Z10Z10Z10Z22Z52112C0013ZAAC0Z00Z00Z6012200Z13Z13Z13ZC0053ZC0023Z23Z03Z00Z00Z00Z
This next one isn't all quite about "how", but more about "when".
Key Element 40132001523313143112C0013Z13Z43331433413213132131335Z015240251601511045253Z0333113Z50231435112322223222032226015260152601511315160Z60Y2230131133311311243322403213Z170152401311045270Z00Y2213131431313322200Z323413Z16015203151131123Z110Z10Z30221032213322200Z00Z3Z15313200151403124033110Z4321100Z131121311200Z1032101131C003113170312322Z0Z10Z10Z223216032100Z7333251132A010Z31241101313014110Z2232140341103211032131252Z316014140142B333180Z10Z223316333100Z71322C003321152131C0010Z10Z10Z10Z2232100Z00Z023214121133ZC0040Z633326333140121601122232140341633316333101132912115345270142504515311210Z10Z13331233310333153331
Well this died quickly. Maybe if I bring in a marathon map, more submissions will come in.
Modern Marathon 5Z2C004014133521001210Z1B0Z3235100Z3131100Z33112AAB040Z00Z00Z00Z00Z203Z0ZAA004013100Z00Z00Z00Z00Z203Z0ZAB33331B0Z00Z00Z00Z00Z203Z0ZB0ZA020Z00Z80Z4033200Z30321312Z0ZC0040121A020Z10Z403521013231331221215012110ZAA0020Z3043100Z00Z92121221214115110ZAA0020Z00Z00Z00Z00Z4Z100Z10ZAA0020Z60Z60Z00Z00Z0112Y10ZAA003054160Z10Z3031200XZ110ZAAB010Z10Z00Z3331100Z00Z10Z10Z10Z10Z10Z10Z10Z40Z00Z00Z00Z41121
Well, it looks like my code has turned into a scrolling bar. In which case, highlight the scrolling bar and copy/paste it in order to obtain the level code.