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Starcraft uses a mix of TCP and UDP[1]. I can't find the link now but I remember something about a late switch from TCP to UDP in the beta of the first StarCraft 2 game and some pretty unstable network gameplay while they were tweaking the error handling.

1. https://us.battle.net/support/en/article/300479

Most sites that I come across say that Brood War primarily uses UDP, along with most other similar vintage Blizzard games.

http://wiki.teamliquid.net/starcraft/Port_Forwarding

starcraft II uses TCP and UDP. I have verified this by reviewing my firewall, I have not gone as far to take pcaps and see what packets are doing what but I thought this was relevant enough to say.

as the parent mentioned -- UDP where time is more important than reliability. I disagree with his last comment on building your own reliability -- use TCP for that.

tcp/1119, udp/dynamic (listed app definitions for app-based firewall)

some additiona blizzard info --> https://us.battle.net/support/en/article/configuring-router-...