Tetris (Sega)

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Tetris
SegaTetrisTitle.png
Developer(s) Sega
Publisher(s) Sega
Release date(s) 1988
Platform(s) Arcade
Gameplay Info
Next pieces 1
Playfield dimensions 10x20
Hold piece No
Hard drop No
Rotation system Sega Rotation (no wall kicks)
SegaTetrisGameplay1.png 138px

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

  • Speed levels, in frames per row
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 a level.

  1. Erase 4 lines.
  2. Put any tetromino after the "level timer" reaches to certain value. (Level will not increase if line clear happen.)

The "level timer" will increase every 256 frames. If the level increases, the timer will be reset in 0.

Level Required time
0 14
1 9
2 9
3 9
4 9
5 9
6 9
7 9
8 9
9 14
10 14
11 9
12 9
13 9
14 9
15 14

Current level timer is stored at C72336h in the RAM.

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.