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Ensure your router allows Steam’s P2P traffic. The most critical ports to open are UDP 27000 to 27015 and UDP 4380 .

Every player in the lobby must go to Help & Options > Game Settings and set Vertical Sync to OFF . online fix castle crashers best

One player hosts the game locally. Friends connect via Parsec, which streams the game to them with near-zero latency, effectively making the game think you are all playing on the same couch (local co-op). Summary of Best Settings Ensure your router allows Steam’s P2P traffic

Create a character (you don't need to actually finish it) and . online fix castle crashers best

If the built-in netcode simply won't cooperate, many players use Parsec to bypass the game's online system entirely.