tic80.com, browsed right here.No accounts and no central server — peers meet over public relays and connect directly. If someone behind a strict firewall/NAT can't connect, add a TURN relay under Connection settings below.
Browsing the full tic80.com catalog. Any cart loads, but rollback netplay needs a deterministic game — some single-player or randomness-heavy carts may desync. Two-player titles work best.
Most peers connect fine on the default public STUN server. A minority behind strict NATs/firewalls need a TURN relay to connect — if a player can't join, fill in a TURN server below.