Tetris The Grand Master (series)

Tetris: The Grand Master is a series of Tetris games developed by Arika.

Gameplay

Rotation system

Main article: Arika Rotation System

The TGM series uses various rotation system but the primary one is the Arika Rotation System (ARS). TGM1 and TGM2 both use ARS. TGM3 has two distinct systems used in Classic (extended ARS) and World (SRS). TGM ACE uses three systems SRS, ARS1 and ARS2.

ARS inherits its tetromino colors and rotation rules from Sega's 1988 arcade version of Tetris, and expands it by implementing wall kicks, which allow pieces to rotate in tight spots.

Initial Rotation System

Initial rotation system or IRS is a ability to rotate a piece before it appears by holding a rotate button during the appearance delay.

Delayed Auto Shift Delay

Delayed auto shift delay (横溜め時間 yokotame jikan) or DAS is the number of frames of delayed auto shift. Holding left or right for the specified amount of frames, horizontal movement will be 1G.

Lock Delay

Lock delay (接着時間／固定時間 setchaku jikan or kotei jikan) is the number of frames until a piece locks down and is no longer movable. If the altitude of the piece changes, the lock delay countdown will be reset.

Line Clear Delay

Line clear delay (消去時間 shoukyo jikan) is the animation frames of line-clearing animations. During delays, the game accepts input for DAS, IRS, and IHS.

Appearance Delay

Appearance delay (出現時間 shutsugen jikan) or ARE is the number of frames between a last block locked to a new block appears. During this delay, players can input actions for DAS charging and IRS.

Time attack

A large amount of mechanics in the game for assessing the performance of the player is tied to time, including the Grade Recognition System in TGM2 and the Section COOL/REGRET system in TGM3. Therefore, it is incentivized to play faster in order to achieve a better grade. Also, as a timer is shown in-game, it is easy for players to compare against one another for speed.

Time attacks are popular for the series, especially for TGM1, where the conditions for the GM grade is relatively easier to achieve compared to its sequels, making time the main aspect to further compare runs.

20G build

20G is when it takes one frame for the block to hit the bottom of the play field.

See:

Invisible credits roll

In TGM2 and TGM3, if the player finishes all 999 levels, the credits roll, and the player is able to still play during it. However, it is possible that the pieces become invisible immediately after locking. This is called the M-roll in TGM2 and invisible roll in TGM3. Both credit rolls play a role in determining the final grade awarded.

See:

http://www13.plala.or.jp/TETRiS_TGM/kouza/16.htm (bottom page)

Wall kick analysis

Synchro analysis

In a frame, actions effect in order 'Rotation -> Move -> Drop'.

If player rotates without DAS to left

Rotate Block
No Move
Drop Block

If player rotates with DAS to left

Rotate Block
Move Left Block
Drop Block

More advanced technics are described in http://www13.plala.or.jp/TETRiS_TGM/kouza/12.htm

Miscellaneous tips

4 directional Arcade Stick limitation need

Basic block control flow

Check the Initial Rotation
A new block appears
loop until a block locked.
1. Check a block actions. (Actions effect following the below sequence in a frame.)
  1. Rotation
  2. Horizontal Move
  3. Vertical Drop
2. Check to lock a block

Development

Games