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Did you not play turn-based games before?
TBF I was like 11 when I first played it, was a real tough game compared to modern Fallout 3/NV.
Fallout New Vegas derived from Fallout 1/2, especially with the evolution of the New California Republic that started in Shady Sands back in Fallout 1.
Many characters of Fallout 1/2 were mentioned in New Vegas, like Marcus and Jacob, oh and the Vertibird crashed Daisy Whitman in Fallout 2, etc.
Are you talking background or gameplay? obviously the latters is completely different.