In "William Shatner's TekWar" you can select the mission using the subway, and also there are a Virtual World. It was very original. Sad that the game were horrible* but had great ideas like the subway and the "almost inteligent" policemen and citizens.
Another pioneer game: "Catacomb". The first levels are pretty lineal but after lever 4 or 5 each level has two or more exits and the game became a 3D labyrinth.
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* It was the first game made with Build, the engine used in Duke Nukem 3D, Shadow Warrior and Blood, and it was unfinished when they published TekWar...
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