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Thanks for the explanation! I assume you built a visual map editor to make these levels, rather than writing that data directly?

• phoboslab 5y ago
  I used TrenchBroom[1] to build the levels. It was initially created to build Quake maps but now supports many derivative games like Half-Life, too. I can't speak highly enough of it; it's really really good! [1] https://trenchbroom.github.io/ https://trenchbroom.github.io/