RuneHQ on a chunky 2004 Dell Laptop that would overheat to the point of burning me, next to the in-browser version of runescape.
I will always remember and curse the clue scroll guide for the puzzle boxes. As a kid I would literally spend a full day doing it, and then I would log out and it would reset and I would spend another full day doing it.
Thanks for all the fish - it was an internet that will never return