Krew.io

Krew.io is a unique multiplayer 3D third-person shooter web-based game. Included within the io games category, but vastly different compared to most of its competition, Krew boasts an overall pirate theme where players compete to sink each other, race for loot, and attempt to be a successful pirate.

The game is mostly competitive, as players battle each other for #1 on the in-game leaderboard, but is also somewhat cooperative, as players on the same ship will have to work together to sink enemies and pilot the craft.