Tetris The Grand Master 4 The Masters of Round

Tetris The Grand Master 4 The Masters of Round, abbreviated TGM4 was unveiled at Sega's Amusement Machine Show in September 2009. At least three modes of TGM4 were shown. Master mode, Konoha mode (a mode in which all pieces are double size and the object is to completely clear the playing field of blocks as many times as possible), and Rounds mode (similar to T.A. Death and Shirase modes, but with at least 2,500 levels and a fog mechanic that prevents line clears below a particular height until certain conditions are met). TGM4 was supposed to run on the Sega RingWide hardware. However the game's release was officially canceled. This was most likely due to Arika's conflicts with The Tetris Company regarding the lack of use of the Tetris Guideline, and an inability to find a publisher.

Konoha Mode Gameplay Video
The music in this gameplay video is the one heard in the Sakura mode of Tetris: The Grand Master 3 - Terror-Instinct. PSBzochNj00

TGM2015
This game was again tested in 2015, this time under the name TGM2015. However, the same TTC issue has since affected this, so this game is turning out to be vaporware.