I'm sorry, but I do not have any information on a game called "Nitro Knight io". However, there are several popular .io games that involve knights or medieval themes. Here are a few examples:
Agar.io: This is a classic .io game where players control a cell and try to grow by consuming other cells while avoiding being eaten themselves.
Zombs Royale: This is a battle royale-style game where players compete against each other on an island filled with weapons and resources. The last player standing wins the game.
Lordz.io: This is a strategy game where players build their own medieval kingdom and compete against other players for resources and territory.
CastleWars.io: In this game, players build and defend their castles while trying to destroy opponent's castles using various weapons and tactics.
Bonk.io: This is a physics-based game where players control a ball and try to knock other players off the platform while staying on themselves.
I hope this helps you find the kind of game you're looking for!
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