Have you ever played a game of D&D that were set in a unorthodox

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Have you ever played a game of D&D that were set in a unorthodox age?
Normally, D&D exists in a sort of 1400-1500 european age (without gunpowder).
But the 3.5 Dungeon master guide had rules for gunpowder weapons, bronze and stone age technology, heck it even had some modern and future tech.
So tell me, /tg, how was your game-out-of-time like?
How did it differ from normal d&d?