Play: ssh netris.rocketnine.space
Repository: https://gitlab.com/tslocum/netris
netris is a competitive terminal-based Tetris clone. Three public lobbies are available, or you may create a custom lobby and limit players’ top speed and the maximum number of players.
If you’re interested in how Tetris may be implemented in Go, see the first part in my series of tutorials: https://rocketnine.space/post/tetris-1/