When talking about feature phone apps, you can never leave out the G-MODE version of "TETRIS". The "TETRIS DIAMOND" version, one of the most popular versions of TETRIS, is back as a G-MODE archive! There are 4 types of game modes included. Starting with the normal "TETRIS mode", "DIAMOND mode" where you can get a bonus score by erasing the line with "Diamond Tetrimino", and "PUZZLE mode" that erases all lines using limited blocks. There are various rules. In addition to familiar techniques such as "TETRISTM line erasing" and "T-SPIN", let's aim for a high score by making full use of the new technique "DIAMOND" using "Diamond Tetrimino"! Please enjoy the glittering world of "TETRIS" that still does not fade.