There are 3 Multiplayer projects
github.com
Jigsaw Puzzle Bot
Turn any image into a Jigsaw Puzzle and solve it together with friends without leaving Telegram
Won 3rd place in the Telegram Web App Contest
penpalsdelight.com
Pen Pals' Delight
An online pen pal simulator. Make friends, exchange letters and packages. Create and share custom items. Decorate your room. Write, share and collect books
github.com
Tic-Tac-Toe Bot
A multiplayer Tic-Tac-Toe game inside of Telegram