People talk like most games use UDP, but they don't.
Pretty much the only genre that does is First Person Shooters.
MMOs (like world or warcraft)
MOBAs (like Dota)
RTSs (like Starcraft)
Action RPGs (like Diablo)
All of these are action games and use TCP.
In most genres people would rather have the simulation pause when there is packet loss, and then run fast to catch up rather than have unreliable data about player locations.
Due to the large number of geographical locations you can have your servers in these days, it's common for most of your players to have pings <30ms. With that kind of latency and a few tweaks, it's possible for a single packet lost to be recovered very quickly with TCP.
Pretty much the only genre that does is First Person Shooters.
MMOs (like world or warcraft) MOBAs (like Dota) RTSs (like Starcraft) Action RPGs (like Diablo)
All of these are action games and use TCP.
In most genres people would rather have the simulation pause when there is packet loss, and then run fast to catch up rather than have unreliable data about player locations.
Due to the large number of geographical locations you can have your servers in these days, it's common for most of your players to have pings <30ms. With that kind of latency and a few tweaks, it's possible for a single packet lost to be recovered very quickly with TCP.