Tetris: The Grand Master – a series of arcade games by the Japanese manufacturer Arika. This is a modified version of the Tetris game that has a particularly high level of difficulty and is therefore aimed at professional Tetris players.
The aim of the game is to reach the Grand Master rank, which is linked to certain requirements. Although none of the games have ever officially been released outside of Japan, they enjoy great popularity among the Tetris community worldwide.
Tetris: The Grand Master uses a fundamentally different level system than other Tetris games. Each placed tetromino increases the level by one, and completing one or more rows also increases the level. The difficulty of the game increases every 100 levels, at level 999 the game is over. However, the 100th level must be reached by completing a row, placing tetrominoes does not increase the counter and it remains at 99, for example, until a row is completed.
In addition, the game is mainly defined by the ranks. These go first from 9 to 1, then from S1 to S9 and finally the highest rank, GM (Grand Master). To rise through the ranks, it is not enough just to achieve a particularly high score, but different requirements must be met depending on the game, for example, around 100 levels must be reached within a certain time limit.
Tetrominos fall significantly faster in Tetris: The Grand Master than in other Tetris games, which is why a separate unit of measurement has been established for the falling speed, G. Here, 1G corresponds to a falling speed of one block per frame. From a certain level, the tetrominoes no longer fall at all, but appear immediately on the floor of the playing field; this state is also referred to as 20G (20 blocks per frame). This falling speed represents a particular challenge, as the tetrominoes can no longer be placed anywhere on the field, but always fall in the middle of the field and then have to be pushed into the desired position.