STACKR — online competitive stacking

clear · cancel · climb

Compete · Improve · Belong

The next generation of competitive stacking

Fast matchmaking. Precise controls. Serious competition. Play ranked, rooms, and solo modes in the browser.

RANKED 1V1 Best of 5

NovaStack 2,354

HOLD

NEXT

ATK8

LINES24

TIME0:47

VS

GARBAGE 6

PixelPusher 2,201

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ATK12

LINES22

TIME0:47

Ranked 1v1Skill-based matchmaking

Live roomsPublic and private

Play instantlyIn your browser

MobilePlay anywhere

Play your way

More ways to play

Replays and boards

Learn and account

Learn

Guide

Rules, stats, and how a match is played.

Understand
the game.
Play better.

The basics

Attack flow

From your clear to your opponent’s board.

1ClearYou clear lines or spin a piece.
2CalculateSTACKR computes attack from the clear type.
3CancelPending attack is reduced by incoming garbage.
4SendThe remaining attack goes to your target.
5Bar / injectAfter a short delay, lines appear on their board.

1 · Clear lines or spin

A single, double, triple, quad, or spin generates attack. Bigger clears and spins send more.

2 · Calculate attack

Attack tables turn the clear into a base amount. Combo and back-to-back can raise it. Bigger clears send more attack.

3 · Cancel with incoming

Your pending attack is reduced by garbage you are about to receive. If you receive more than you send, the extra lines remain.

4 · Send to target

After cancel, the leftover is sent using the mode’s targeting: even, random, payback, or eliminations. A full cancel sends nothing.

5 · Bar / inject on their board

Sent lines enter the target’s garbage bar, then inject after the delay (default 500 ms). They can still clear to cancel some of it.

In one sentence

You clear → STACKR computes attack → cancels your incoming first → leftover hits their garbage bar → after the delay, armed lines appear when they lock a piece.

Base attack (before combo / B2B)

Clear	Normal	T-Spin / Spin	Mini
Single	0	2	0
Double	1	4	1
Triple	2	6	0
Quad	4	—	—

A difficult clear (feeds B2B) = any spin clear, or a Quad.

After base (Battle / Team)

Apply combo multiplier (see Combo tab).
If this clear continues B2B → +1 attack.
If B2B breaks and surge was charged → add surge size.
Margin: +1 attack per 90s of match time.
All Clear (empty board) → +10 attack (+2 B2B streak levels).
Garbage special (quad/spin while clearing garbage) → +1.

Then cancel / send Attack first cancels your pending garbage (1:1, or 2× in opener / volatile). Remainder is sent (split into chunks by Attack split, default 4). Passthrough skips cancel.

Solo scoring note Sprint / Blitz / Zen use a classic additive combo table and ×1.5 B2B on big clears — different from Battle’s combo multiplier. Score still uses Guideline-ish line values × level.

Combo multiplier formula — Battle / Team combo formula (from the engine)

What is a combo? A combo is a chain of clears without a no-clear lock in between. comboBefore = how many clears you already did in this chain (0 on the first clear of the chain). After a clear, displayed combo becomes comboBefore + 1 (e.g. “COMBO x3”).

Worked examples (Battle)

Clear	comboBefore	Base	Attack
Double	0	1	floor(1×1.00) = 1
Double	4	1	floor(1×2.00) = 2
Quad	0	4	4
Quad	4	4	floor(4×2.00) = 8
T-Spin Double	2	4	floor(4×1.50) = 6
Single (base 0)	3	0	floor(log(1+3.75)) ≈ 1

B2B (Back-to-Back) Doing difficult clears back-to-back raises the B2B streak. The second difficult clear in a row (and later ones) get the B2B label and +1 attack. A normal Single/Double/Triple with no spin breaks the streak.

Surge When B2B streak ≥ 4, surge charge = streak size. Breaking B2B with a non-difficult clear dumps that charge into attack (big spike). Keep chaining Quads / T-spins to grow it; dump on purpose or by accident.

Game modes

Each mode has its own rules and win condition.

Same core mechanics.
Different ways to play.

Sprint

Clear a line goal (20–100) as fast as possible. PB saved locally; cloud when signed in.

SpeedrunLine goalLocal PB

Cheese Race

Board starts with garbage. Dig it all. Messiness is how often holes shift.

Garbage startDig it allShifting holes

Survival

Cheese rises on a timer. Last player alive wins.

Difficulty	Rise	Gravity
Easy	1.6s	Off
Normal	1.0s	Off
Hard	0.7s	Mild
Expert	0.45s	High

Online Survival uses the room’s rise setting instead of these solo presets.

Blitz

2-minute score attack. Combos, B2B, and All Clears score big.

2 minutesHigh scoreCombos & B2B

Zen

No timer or KO pressure. Undo, redo, inject cheese, gravity override.

PracticeNo pressureTraining tools

Battle / Team Battle

Full attack system. FFA last standing, or Red vs Blue. Optional series (bo3 / bo5 / bo7).

FFATeam BattleSeries

Race (online)

First to the line goal. Enable Same seed so everyone shares the bag.

First to goalSame seedOnline

Play HUD

Stat	Meaning
ATK	Lines you successfully sent
RECV	Lines you received
APM	Attack per minute (not key presses)
PPS	Pieces per second
GARBAGE	Your pending bar total
COMBO / B2B / SURGE	Current chain state
VS	~100 × (attack + downstack) / seconds
KPP / Finesse	Keys per piece · misdrop faults

Room rule presets Casual (slower bar), Competitive (500 ms), Cheese (dirty + volatile), Slow (easy handling). Tune messiness, opener pieces, gravity, lock delay, multiplier, split, passthrough, same seed.

Account

Account

Manage your identity, settings sync, rank, and friends.

SIGN IN

Sign in for ranked & rooms — or try Sprint / Zen below.

Username Display name (optional) Password

Or try without an account

PLAYERS / RANK LADDER

Rating updates from Battle & Team multiplayer while signed in. Solo PBs are under History → Cloud Boards.

Find player

Play · Compete · Improve · Belong

What do you want to play?

Jump into a match, create a room, or try a solo challenge.

Same game.
More ways to play.

Competitive

Climb the ladder and prove your skills.

Casual

Relaxed rooms and fun game modes.

Solo

Beat your own records and master your skills.

Custom

Your rules, your room, play with anyone.

Guest modes Try without an account

Play Sprint and Zen instantly. No sign up required.

SprintZen

Account modes Unlock everything

Save your progress, get a ranking, and join all game modes.

All modesLeaderboardsCustom rooms

SCORE

0

LINES

0

LEVEL

1

TIME

0:00.000

BEST

—

More stats

COMBO

—

B2B

—

SURGE

—

GARBAGE

0

PPS

0.00

APM

0

FINESSE

—

ATK

0

RECV

0

KPP

—

VS

0.0