Tetris DX

Tetris DX
[[File:{{{boxart}}}\|175px]]
Developer(s)	Nintendo
Publisher(s)	Nintendo
Release Date(s)	21, Oct 1998 (Japan) 31, Oct 1998 (USA) 1, Jul 1999 (Europe)
Platform(s)	Game Boy Color
Gameplay Info
Next pieces	1
Playfield dimensions	10x18
Hold piece	No
Hard drop	No
Rotation system	{{{system}}}
Has 180 rotation	{{{180}}}
Adjustable tuning	{{{tuning}}}
Garbage attack type	{{{garbage}}}
Garbage blocking type	{{{blocking}}}
Website	{{{website}}}

Not to be confused with Tetris Deluxe, a game released for western mobile phones.

Tetris DX was a Game Boy Color game as an enhancement of Nintendo's original Game Boy Tetris, with two added gameplay modes (Ultra, lasting 3 minutes; and Vs. CPU, a match against the computer), a profile/save feature, and color graphics on Game Boy Color and above. In addition, the game's rotation system had a glitch which lets a player move any tetromino except O upward by holding the direction against a wall while rotating in the opposite direction.

Modes

Marathon (score maxes at 9,999,999)
True 40 lines mode (not 40 "points" like in Tetris Worlds)
Vs. CPU opponent

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. Alternate rotation resets the gravity timer.