Why NAT matters
Meccha Chameleon uses peer-to-peer networking. If your router uses strict NAT, friends cannot connect to your lobby.
Free fixes
- Enable UPnP on router (see /network/upnp-setup)
- Host on Ethernet, not Wi-Fi
- Windows Firewall → allow
PenguinHotel.exe - Restart router after changes
Test
Host a private lobby; if only same-network friends join, NAT is likely the issue.
If still strict
Consider VPN with NAT traversal or game booster — only after manual steps fail.