T2Net is a variation of TetriNET, and was programmed by Xunk of Xunk Entertainment. It has 8 player support (although more may join and watch), and is noticeably faster than TetriNET. Other features include playing with or against robot opponents (algorithms), a special Pentomino Mode (Blocks are wierd ;). One possible downfall to T2Net is its complexity in setup, and the fact that it uses window-based playing fields is a bit difficult to adjust to. The latest version is 4.15. 

Improvements to be in 4.16 are that a NEW special block will be unveiled, and a bug with the tile feature will be fixed. 


Below is a Screen Shot Of T2Net
(using my T2Net HoRRoR Pro Theme)