Back in 1973 we find the origins of first person games, the grandfather and grandmother of everything that came after. (pixeljudge.com)
The maze was rendered in monochrome using a fixed perspective, something that would become incredibly popular with developers wanting to make first person games on the restrictive hardware of the next two decades. (pixeljudge.com)
But, as you all better realise by now, the best first person game ever was based on this principle. (gillen.cream.org)