Ensure Castle.exe is added to your Windows Defender "Allowed Apps" list. Disable Fullscreen Optimizations: Find the Castle.exe in your Steam folder. Right-click > Properties > Compatibility . Check Disable fullscreen optimizations . 🏆 The "Pro" Workaround: Steam Remote Play Together
and find that you can no longer connect to online matches at all, a common community fix has emerged on Create a Character : Go into the Painter Boss editor online fix castle crashers best
: Once the lag stops at low resolution, have players raise their resolution one by one to find whose PC is causing the bottleneck. Alternative Connection Methods Quick Verdict Allow through Firewall: Ensure Castle
This is the standard "fix" for unofficial versions. It involves downloading a repair patch and extracting it into your game directory. Both you and your friends must use the same fix to play together via the Steam overlay . Check Disable fullscreen optimizations