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Tetris is a falling-block puzzle about turning a stream of tetrominoes into complete horizontal rows before the stack reaches the ceiling. Small placement choices matter because one awkward overhang can stay on the board for many pieces, while one clean tuck can keep the center open and the well usable. This game tool makes that tradeoff visible in real time by tying every placement to row clears, speed pressure, and the stack you have to inherit on the next piece.
This tool turns that puzzle into a focused browser practice run with live scoring, line and level tracking, and planning aids for where the current piece will land or which shape you want to save for later. It is a good fit when you want a quick session to work on stacking discipline, faster reads of the next queue, or recovery after a bad sequence without installing a separate game client.
The three opening speed presets matter because they change how quickly gravity starts pulling pieces down. Slow gives you space to rehearse shape recognition and flatter stacking, while Medium and Fast expose whether those habits still hold once hesitation becomes expensive.
A typical use case is a short warm-up before playing a stricter Tetris variant elsewhere. You might begin with ghost guidance enabled, practice keeping a clean lane for long pieces, then run the same session again with the same options to see whether your line count pushes past 10 into Level 2 rather than just hoping a lucky sequence carried the score.
The results should be read as scores from this exact build, not as universal Tetris rankings. The scoring table, rotation kicks, and local best-score memory are specific to this package, so a strong run here does not automatically translate to official guideline play, classic console scoring, or another browser version with different movement rules.
Start on Slow if your main problem is messy stacking rather than raw pace. Leave Ghost enabled until you can reliably picture the landing spot yourself, and use Hold for genuinely awkward pieces or for saving an I piece for a clean well instead of treating it like an unlimited undo.
Medium is usually the better honesty check once you want to know whether your board reading is improving. A run that reaches a higher Level with steadier Lines cleared on Medium often says more about real progress than a Slow run padded by safe hard drops and extra thinking time.
A common misread is treating every higher score as better play. Because hard drops also add points, a flashy run can outscore a cleaner one while actually clearing fewer rows and topping out earlier, so the safer judgment is to compare score alongside Lines cleared and Level reached from the same preset.
The playfield is a 10 by 20 grid. Pieces come from a shuffled seven-piece bag, so every cycle contains one each of I, J, L, O, S, T, and Z before the next bag is shuffled. That keeps the queue from behaving like pure piece-by-piece randomness and makes long droughts less extreme than they would be under unrestricted random selection.
Movement is cell-based. Left and right shift the active piece by one column when the target cells are open, soft drop moves the piece down one row at a time, and hard drop sends it straight to the lowest valid landing position. Rotation uses a short fixed kick list rather than the full rotation tables used by stricter guideline implementations, so some tight twists that work in other versions will fail here.
When gravity or a hard drop finishes the move, the active piece locks into the grid, full rows clear, score updates, and the next piece spawns. Hold is locked after one use and only resets after the current piece locks. Level increases every 10 cleared lines, and the gravity timer speeds up by 50 milliseconds per level from the chosen starting preset down to a 60 millisecond floor.
| Rule | Value | How it affects a run |
|---|---|---|
| Soft drop | +1 point per row | Adds a small bonus while you manually accelerate a piece downward. |
| Hard drop | +2 points per row | Rewards fast commitment, even when no line clears on that placement. |
| Single / Double / Triple | 100 / 300 / 500 × Level | Multiplies line-clear value by the current level at the moment of clear. |
| Four-line clear | 800 × Level | The highest line-clear reward in this build. |
| Slow / Medium / Fast | 900 / 700 / 500 ms start | Sets the starting gravity interval before level acceleration applies. |
| Level threshold | Every 10 lines | Level 2 begins at 10 cleared lines, Level 3 at 20, and so on. |
| Output | Format | Meaning |
|---|---|---|
| Score | Integer | Total of line-clear points plus soft-drop and hard-drop bonuses. |
| Lines | Integer | Total cleared rows across the current run. |
| Level | Integer | Current speed tier derived from cleared-line count. |
| Best | Integer | Highest score saved in local browser storage for this device and browser profile. |
| Next / Hold | Piece previews | Shows the queued piece and the saved piece, if Hold has been used. |
| Game Over summary | Run snapshot | Reports Speed preset, Score, Best score, Lines cleared, Level reached, Ghost / Hold, Sound, and Run duration. |
Use the run summary as your checkpoint at the end of each session, not just the final pile on the board.
Score is the headline number, but Lines and Level often explain the run better. A score boosted by aggressive hard drops can look impressive while hiding a fragile stack, whereas a slightly lower score with more Lines cleared and a higher Level usually reflects stronger survival and cleaner placement.
The easiest false-confidence trap is assuming a higher score automatically means stronger fundamentals. Verify that impression by checking whether the same preset also produced better Lines cleared, longer Run duration, or a higher Level under the same Ghost / Hold setting.
A slow warm-up run with Ghost on and Hold on might end with Score 4,820, Lines cleared 13, Level reached 2, and Run duration 03:14. That is a healthy practice result because it crossed the 10-line boundary into Level 2 and stayed alive long enough to show steady stacking rather than one lucky burst.
A boundary case is a run that finishes with Lines cleared 9 and Level reached 1. Even if the Score feels respectable, the game never crossed the first speed threshold, so you should read that run as “almost ready for faster pressure,” not as proof that Medium will feel comfortable.
A common troubleshooting moment happens when you press C twice and the Hold panel does not change on the second press. That is expected here: Hold unlocks only after the current piece locks. Finish the placement, then the next active piece can be moved into Hold again.
This package uses its own score table and a short fixed kick list. Soft drops, hard drops, and four-line clears are scored according to the rules shown above, so the same stack played in another Tetris version can produce a different total.
Usually yes. The Best value is read from and written to local browser storage, so it survives refreshes in the same browser profile on the same device unless local storage is cleared.
That is a built-in rule of this implementation. After one hold or swap, the engine locks Hold until the active piece lands and becomes part of the stack, which prevents cycling through the queue until a preferred shape appears.
The playfield renderer depends on WebGL support. If the board area appears blank or incomplete, try a current browser with WebGL enabled, then start a fresh run and confirm that the opening speed overlay clears normally.