For friends outside your local network to join, you must port forward your router or use the VPN method mentioned above.
: Using tools like LogMeIn Hamachi or Radmin VPN allows you to create a virtual local network. Install the VPN and create a private network. Have your friends join that same network. For friends outside your local network to join,
The host starts the game and provides their virtual IP address (visible in the VPN client) to the other players. For friends outside your local network to join,
For mobile users (iOS/Android), there are specific apps designed to facilitate multiplayer: For friends outside your local network to join,
: Some community sites like FreeTP.Org provide versions of the game pre-configured with "online fixes" (like the Goldberg or Steam emulators) that allow multiplayer functionality without a paid license. Mobile Multiplayer Options