Tetris Stardust

Tetris Stardust
Tetris Stardust icon
Publisher(s)	Tetris Online Japan, Inc.
Platform(s)	Web (Silverlight)
Release	c. December 2009
Gameplay info
Next pieces	5
Playfield size	10 × 20
Hold piece	Yes
Hard drop	Yes
Rotation system	SRS

Tetris Stardust is an online free-to-play Tetris game released in Japan by Tetris Online Japan, Inc.

Gameplay

Tetris Stardust features a single game mode in which the player must score as many points as possible in 40 lines. It uses a modified version of the Guideline ruleset.

The game features spin recognition for all tetromino types and a Spin Rank system to reward the player for performing a variety of twists. Performing multiple unique twists with the same piece will award higher spin ranks.

Star Marks are randomly placed on the playfield. When all spaces with Star Marks are occupied, an avalanche will be triggered. This will effectively break every piece on the playfield into individual blocks and cause them to fall. Additional points are awarded for clearing lines with avalanches.

Rotation System

The rotation system in Tetris Stardust is SRS with some modifications to allow wall kicks with the O tetromino. Normally, the O tetromino does not move when rotated, but if one of the following checks succeeds, the game will bypass basic rotation and perform a wall kick.

• If rotating left, the space directly underneath the lower-right block must be occupied
• If rotating right, the space directly underneath the lower-left block must be occupied

O Tetromino Wall Kick Data

	Test 1	Test 2	Test 3	Test 4
CW	( 1, 0)	( 1,-1)	( 1,-2)	( 2,-1)
CCW	(-1, 0)	(-1,-1)	(-1,-2)	(-2,-1)

Scoring

Scoring is mostly based on Guideline scoring. However, the logic which calculates the score for a piece actually yields two main values: a Finish Score, which includes line clear, spin (not Spin Rank), and combo points; and a Total Score, which includes all of these plus perfect clear, hard drop, and soft drop points. Both of these values are used to increment the player's score, which causes all line clear, spin, and combo points to be doubled.

Additional values are defined for certain spins performed with non-T tetrominoes and the unique "Spin Rank" mechanic.

Below is the effective scoring table after accounting for the score doubling quirk.

Action	Points
Single	200
Double	600
Triple	1000
Tetris	1600
T-Spin Zero1	800
Spin Zero	200
Spin Single	1600
Spin Double	2400
Spin Triple	3200
T-Spin Mini Single	200
Spin Mini Single	400
Spin Mini Double2	1200
Combo	100 × combo count
Soft Drop	1 × cells
Hard Drop	2 × cells
Perfect Clear3	0
Back-to-Back	Action Score × 1.5
Spin Rank E	50
Spin Rank D	100
Spin Rank C	200
Spin Rank B	400
Spin Rank A-	600
Spin Rank A	800
Spin Rank A+	1000
Spin Rank S-	1400
Spin Rank S	1600
Spin Rank S+	1800

¹ There is no separate score value defined for a T-Spin Mini Zero. Because of this, it scores the same as a T-Spin Zero (800), which is significantly more than a T-Spin Mini Single (200). This is most likely an oversight.
² Displayed in-game as "(Piece)-Spin Mini-W" for non-T pieces. T-Spin Mini Doubles do not display anything, but still award 1200 points.
³ While the game recognises and displays Perfect Clears, there is no score value defined for them.

External links

• Tetris Stardust archived on tetrisonline.pl (requires Silverlight)