Tetris The Grand Master
|Tetris The Grand Master|
|Playfield dimensions||10 × 20|
|Rotation system||TGM rotation|
TGM's gameplay is heavily inspired by it's arcade predecessor, Tetris (Sega) released 10 years earlier. It uses a modified rotation system, color scheme, and relies heavily on mechanics such as lock delay. Another game which inspired TGM is Shimizu Tetris, a fan game which was the first to introduce 20G gravity.
The main goal in TGM is to score points, awarding the player a higher grade. The game ends when a player reaches level 999. If the player scored enough points, they will be awarded with the grade S9. To achieve the grade GM, the player must also meet some time requirements during play. If the player tops out before reaching level 999, the game ends, awarding the player the current grade and it's "mastering time", the time at which the grade was awarded during gameplay.
Level has a unique implementation in TGM. The level counter will increase by 1 for every piece that enters the playfield. It will also increase by 1 for each line cleared.
When the player is about to increment the hundreds digit (e.g., level 399), only line clears will increase the level. Level 998 is treated similarly, with a final line clear required to reach 999 and finish.
- Main article: IRS
Abbreviation for Initial Rotation System.
Normally a piece will appear in the rotation showed in the piece preview. With IRS, holding either the left or right rotation button will cause the piece to appear rotated 90 degrees. This allows the player a higher degree of freedom when placing pieces at higher game speeds.
- Main article: ghost piece
Abbreviation for Temporary Landing System This system is a semi-transparent representation of where the piece will land if allowed to drop into the playfield. It is displayed up to level 100.
- Main article: Secret Grade Techniques
Secret grade is a hidden grading system that recognizes a ">" pattern in the playfield by leaving holes. The first hole becomes Secret grade 9, and each subsequent hole increasing the grade until row 19, the GM grade. The player must top out to have the Secret grade awarded. A minimum grade of 5 is needed to see the message.
TGM shares the same scoring mechanisms of many other Tetris games:
- The player receive more points for clearing more lines at once.
- Lines are worth more with each passing level. (The nature of "level" in TGM, however, means the amount of points a line is worth is constantly changing, and especially in the 0-99 section, it is to the player's advantage to stack high before clearing lines.)
- The player receive points for forcing a piece down. (Though only when this results in cleared lines, unlike in some other games.)
There are a few scoring mechanisms unique to TGM:
- The player receive a combo bonus for clearing lines with consecutive pieces.
- The player receive a bravo bonus for clearing the entire screen.
Once one can reach the S9 rank, score becomes irrelevant and the focus changes to a time attack rather than a score attack. Nevertheless, here is the actual scoring formula:
- Score = ((Level + Lines)/4 + Soft) x Lines x Combo x Bravo
- Level is the current level the player is on (before the lines are cleared).
- Lines is the number of lines the player just cleared.
- (Level + Lines)/4 is rounded up.
- Soft is the cumulative number of frames during which Down was held during the piece's active time. Note that this means manually locking pieces already on the ground will increase the Soft value by 1.
- Locking a piece without clearing lines sets Combo to 1. Otherwise, the game updates Combo as follows, BEFORE calculating Score:
- Combo = (previous Combo value) + (2 x Lines) - 2
- Example: A double-triple-single combo will have combo values 3, 7, and 7 respectively.
- Bravo is equal to 4 if this piece has cleared the screen, and otherwise is 1.
In TGM grade is entirely determined by score. As you pass certain milestones, the game will assign you the next grade.
|Grade||Required Score||Grade||Required Score|
|300||12,000 (Grade 1)||=<04:15:00|
|500||40,000 (Grade S4)||=<07:30:00|
(slightly higher than S9)
If the arcade operator has enabled Vs. mode, two players can start a Vs. game. One player must first start a game, and during any point of that game the second player may press start to challenge them, and begin a game.
When the player clears 2 or more lines at once, those lines will be sent to their opponent's playfield as garbage lines. If the match does not end within 5 minutes, the game ends in a draw.
Item blocks can be used to attack or defend from the player's opponent.
Clearing lines will fill up the item meter adjacent to a player's playfield. When the meter is full an item block is dealt to the player. They may use it by clearing a line which the piece is part of.
There are 18 different item blocks.
|DEATH BLOCK||Makes the opponent's next block big.|
|NEGA FIELD||Flip the playfield's occupied cells to empty, and empty cells to occupied.|
|SPIN FIELD||Rotate the opponent's field for a short time.|
|180° FIELD||Rotate the playfield upside down and move the newly rotated cells down.|
|SHOT GUN!||Randomly shoot a group of holes in the opponent's stack.|
|HARD BLOCK||The opponent's next piece must be cleared twice to be removed from the playfield.|
|LASER BLOCK||Remove a column of holes in the opponent's stack. The attacker many move the laser by pressing left and right.|
|ROLL ROLL||The opponent's next 3 pieces are auto rotating by a fixed interval.|
|TRANS FORM||The opponent's next 3 pieces will change tetromino every time the piece is rotated.|
|X-RAY||A partially invisible effect is applied to the opponent's stack for a short period.|
|PRESS FIELD||Shrinks the opponent's playfield for a short period.|
|↑ DEL FIELD||Deletes the upper half of the player's playfield.|
|↓ DEL FIELD||Deletes the lower half of the player's playfield.|
|→ MOV FIELD||Push every cell in the player's playfield to the right.|
|← MOV FIELD||Push every cell in the player's playfield to the left.|
|DEL EVEN||Deletes every 2nd row in the player's playfield.|
|FREE FALL||Forces all cells to move down in the player's playfield removing any holes.|
|EXCHG FIELD||Swaps the player's and opponent's playfield.|
All codes must be entered at the title screen. Codes may be combined (i.e. Big 20G mode + Reverse Monochrome mode.) Scores achieved using codes will not be stored on the high score table.
Key: L = Left, D = Down, U = Up, R = Right
- No item VS (Play VS mode without item blocks):
Hold both player Start buttons together before the match begins.
Gravity does not increase uniformly, unlike many other tetris games. It rises and falls, depending on the level as shown in the table below.
The unit for gravity is G (rows per frame), as a fraction with a constant denominator of 256. This means G = Internal Gravity/256. For example, at levels 90 through 99, the gravity is 64/256G, or 1/4G.
|000 - 999||30||14||30||41|
- The player's DAS charge is unmodified during line clear delay, the first 4 frames of ARE, the last frame of ARE, and the frame on which a piece spawns.