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
| 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.