Often, these fixes will make Steam believe you are playing a free game like Spacewar or Cube Racer , allowing you to use Steam’s invite system.
To play the multiplayer mode of using a cracked portable version, you must simulate a Local Area Network (LAN) environment or apply specific online fixes to bypass Steam's verification. Because the game's multiplayer is technically in an experimental "beta" stage, it is prone to significant lag and synchronization bugs for anyone other than the host. Method 1: LAN Simulation (Recommended)
Other players launch their game and go to the or Lobbies menu.
This is the most reliable way to play with friends on a cracked version without needing complex file modifications.