Puzzle Pirates, a mid-late 2000s puzzle-based MMORPG. It’s still around but it’s definitely past its prime, in the “multiplayer” sense (the puzzles still hold up).

The game centers around manning a ship, with several roles needing to be filled, each having 1-2 different puzzles, for a total of 7 I think. Sea battles were also fought via 1-2 different mass puzzles, with everyone on the ship sword fighting or brawling as a group.

There was a whole economy of labor that was used to craft ships, cannonballs, rum, swords, clothing, and other things. Eventually most of these labor activities got their own puzzles.

Players banded together into crews, and crews into flags, culminating in server-wide blockades every weekend over who controlled specific islands. These battles, or PVP between warring flags, could result in sunken ships and various cosmetic injuries (hooks, eyepatches, peg legs).

The player base has drastically shrunk from its peak, leading to too many servers with too few players, with much of the wide-scale interpersonal competition fading away. For example, nobody seriously cares about blockades any more. They used to be enormous events for the most active islands, with gigantic sums of in-game money spent hiring recruits as “jobbers” for flags, manning dozens of ships to attack/defend islands.