Unsung, a World War I adventure in Wolfenstein 3D, lets you slog through the trenches in true pixelated FPS fashion.
Stellar, extremely well-crafted and polished WW1-themed TC for Wolf 3D. It has that elusive quality that quite a few Wolf and Doom TCs tried to achieve: it actually -feels- like a really good early 90s FPS, and not like a recent TC.