Tetris (Sega)

Tetris
Developer(s)	Sega
Publisher(s)	Sega
Platform(s)	Arcade
Release	1988
Gameplay info
Next pieces	1
Playfield size	10x20
Hold piece	No
Hard drop	No
Rotation system	Sega Rotation (no wall kicks)
File:SegaTetrisGameplay3.png

Sega's 1988 Arcade version of Tetris was the version that took Japanese arcades by storm, becoming one of the most commonly known versions of the game. Due to its popularity, it became the base of rules for many other Japanese games created later on, both licensed and unlicensed. Such games include the TGM series, Tetris Plus series, Shimizu Tetris and, to less extent, DTET. It was one of the first games to instate lock delay, improving maneuverability greatly at high speeds compared to games which did not have the feature.

Gameplay specifics

Being an early game, there was only one rotation button, which rotated counterclockwise. The game also contained no wallkicks and no hard drop. However, many of the elements that exist in later games can already be seen here, such as 1G DAS movement, lock delay, ARE, and rotation/movement processed before gravity - allowing for synchro moves to be performed at 1G fall speed. One rule element not commonly seen in recent games is the existence of the field ceiling. The field height is fixed at 20 cells, and any rotation that would exceed that height would fail.

It was one of the first games released in Japan to popularize the "marathon" play model of playing endlessly against increasing speed for survival, as opposed to beating levels or clearing a predefined number of lines.

Techniques

See Tetris (Sega) Techniques

Details

• Soft drop: 1G
• Lock delay: 30 frames
• ARE: 30 frames
• Line clear delay: 42 frames
• DAS: 20 frames

Speed Levels

Level	Easy	Normal	Hard	Hardest
0	48	48	40	30
1	32	24	20	15
2	24	18	16	12
3	18	15	12	10
4	14	12	10	8
5	12	10	8	6
6	10	8	6	4
7	8	6	4	2
8	6	4	2	1
9	4	2	1	1
10	12	10	10	8
11	10	8	8	6
12	8	6	6	4
13	6	4	4	2
14	4	2	2	1
15	2	1	1	1

Current piece speed is located at C7000Ah in the RAM.

Level advancement requirements

There are 2 ways to increase the level.

1. Erase 4 lines in any combination of line clears.
2. Put any tetromino after the "level timer" reaches a certain value. (Level will not increase if a line clear happens.)

The "level timer" increases every frame, except when reset after line clearing and before level-up is shown.

Level	Required time (frames)
0	3480
1	2320
2	2320
3	2320
4	2320
5	2320
6	2320
7	2320
8	2320
9	3480
10	3480
11	1740
12	1740
13	1740
14	1740
15	3480

Level timer max. value for level 15 is used for levels 16 and up. Current level timer is stored at C72336h (word) in RAM in System 16A version; FFE336h in System 16B version. This table is stored at 3D28 in the 68k portion of an unshuffled ROM for System 16B version (MAME tetris2).

Scoring

Level	Points for 1 line	Points for 2 lines	Points for 3 lines	Points for 4 lines	Points for soft dropping pieces
0-1	100	400	900	2000	1 per line
2-3	200	800	1800	4000	2 per line
4-5	300	1200	2700	6000	3 per line
6-7	400	1600	3600	8000	4 per line
8+	500	2000	4500	10000	5 per line

If a line clear also leads to a Perfect Clear there is a 10x multiplier applied to the clear score.

Power-on Pattern

One characteristic of this version of Tetris was the existence of a "Power-on pattern". This referred to the game's behavior that the string of pieces it dealt in the very first game after starting up the system was always the same. This was most probably caused by the state of the randomization seed in the system. After its discovery, players began constructing gameplay plans around the power-on pattern in order to max out the score in the least lines possible. Sega's 1999 version of Tetris (Arcade, Dreamcast) pays tribute to the power-on pattern, by dealing the sequence in the final level of the single-player game.

For MAME players, unless you are playing the bootleg, you must delete your nvram before playing to get the poweron pattern. The B-system version has a different poweron pattern, and does not require you to delete your nvram. It even restores the pattern upon reset, which not even the bootleg will do.

Flash Point also contain a poweron pattern, and uses it for every level you play for the entire game, and if you continue. if you fail to continue, the next game continues where the failed level ended in the poweron pattern. Again, unless you are playing a bootleg without nvram, you must clear the nvram to get the poweron pattern back.

Bloxeed contains a poweron pattern as well. Additionally if you "continue" you will recieve the pieces in the same order again! However, the powerups are NOT included in the poweron pattern, and are truly randomised.

Availability

A fairly accurate representation of the game, along with Tetris: New Century, Flash Point and Bloxeed, can be obtained in the Japanese PS2 game Sega Ages 2500 Series Vol.28 Tetris Collection.

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