Standard cracked games often lose online functionality because they cannot connect to official servers. The 0xdeadc0de fix redirects these connections to a private network or a "Spacewar" (a Steam developer tool) environment, allowing players with the cracked version to play together.
Downloading files from unofficial sources can expose your PC to malware. Party Animals v1.0.3.0-0xdeadc0de
How to Local Multiplayer Split Screen Co-op in Party Animals Party Animals v1.0.3.0-0xdeadc0de