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Tetris DX

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Tetris DX
Tetris DX Boxart.jpg
Developer(s) Nintendo
Publisher(s) Nintendo
Release date(s) JP: 21, Oct 1998
US: 31, Oct 1998
EU: 1, Jul 1999
Platform(s) Game Boy Color
Gameplay Info
Next pieces 1
Playfield dimensions 10 × 18
Hold piece No
Hard drop No
Rotation system Bounding box, wall kick, SRS predecessor
Tetris DX title.png Tetris DX play.png
Not to be confused with Tetris Deluxe, a game released for western mobile phones.

Tetris DX is a Game Boy Color game that enhances Nintendo's original Game Boy Tetris, with three new gameplay modes, a profile/save feature, and color graphics on Games Boy Color games and above. The game's rotation system has a glitch which lets players move any tetromino, except the O-piece, upward by holding the direction against a wall and rotating in the opposite direction.

Modes

Power

Gameplay data is recorded and stored as "POWER". Each profile has its own POWER data. Using a link cable, this data can be transferred to another cart.

In VS. COM, this can be used to play vs a CPU against a local profile, or a transfered profile's game data.

Your power increases as you play better games using your profile.

Rotation system

All rotation states of all seven tetrominoes in TDX. From top to bottom: I, J, L, O, S, T, Z. The circle doesn't appear in the game; it helps to illustrate the axis on which each tetromino rotates.

The rotation system is an early version of what would become SRS. Like in SRS, tetrominoes of width 3 rotate as if in a bounding square; unlike in SRS, L, J, and T start flat side up. TDX first tries rotation about the center of the box (the blue circle). If this fails, it tries rotation about an alternate center displaced by one cell (the gray circle). For I, S, and Z, this center starts out one cell above the ordinary center; for L, J, or T, it starts out one cell below.

Wall climbing

This rotation system is exploitable, especially on low levels:

G.........
G.........
GSSS......
G.S.......
G.........

Charge DAS

G.........
G.S.......
G.CS......
G.S.......
G.........

Rotate left

G.........
GS........
GSS.......
GS........
G.........

Shift left (DAS)

G.........
GSSS......
G.C.......
G.........
G.........

Rotate right about
alternate center

This particular exploit was fixed in SRS.

Infinity

Ordinarily, Tetris DX lock delay follows step reset behavior: only downward motion under gravity resets the lock delay timer. But rotation about the alternate center does reset the timer used for gravity. This can be exploited by placing a piece in a corner and rotating it back and forth about the alternate center:

G.........
G.........
G.C.......
GSSS......
GGGGG.....
G.........
GS........
GSC.......
GS........
GGGGG.....


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