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by Aurel300 1219 days ago
Maybe you are thinking of zahada? It is as you describe, individual HTML pages solved by typing the correct answer into the address bar. It involved a lot of lateral thinking. Sometimes a bit unfair, but it was great fun trying to work this out over several sessions with a friend!

http://www.mcgov.co.uk/zahada.html

There were also some similar games/clones that never quite hit the spot for me.