Content rating
Everyone
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Everyone
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About this game

Three pieces that agree on everything clear the line. That is the whole rule, and it is harder than it sounds.

Every piece carries a colour, a number and a shape. Pop them onto the stack and a line goes only when three of them match on all three counts — about one random triple in twenty-seven. Arranging the rest is the game.

THREE DEPTHS

Harbour is a tutorial rather than a level: colour only, thirty pops, long enough to learn the shape of it.

Ocean is the game played straight — colour, number and shape together. 3.7% of triples clear.

Deep adds a facing arrow and a wider board. 1.6%.

ONE BOARD A DAY

The daily is the same puzzle for everyone on Earth, and you get one attempt at it. Not one attempt unless you pay: one attempt. Finish it and you see where you landed among that day's players.

SCORING FOLLOWS RARITY

A hundred a piece, plus a bonus for how much the line has in common. Orders that read 1-2-3 pay double. Read them 3-2-1 and they pay triple.

WHAT IS NOT IN IT

No ads. No in-app purchases. No unlocks, no tiers, no energy, no timers, no account, no sign-in, no newsletter. Stackit is bought once and that is the end of it.

It plays with no connection at all. The only thing that ever leaves your phone is a daily score, and only when you finish one — never your name, which stays on the device.

Eight rule shapes. A hundred and forty-four trios that clear. Three sweeps a match, for when the stack gets away from you.
Three pieces that agree on everything clear the line. No ads, nothing to buy.
Updated on
Sep 23, 2026
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Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • No data shared with third parties
    Learn more about how developers declare sharing
  • This app may collect these data types
    App activity and Device or other IDs
  • Data is encrypted in transit
  • You can request that data be deleted

What’s new

First release.

Three pieces that agree on colour, number and shape clear the line. That is the whole rule.

Three depths, from a colour-only tutorial to a six-wide board with facing arrows. One daily puzzle, the same for everyone, one attempt.

No ads, no in-app purchases, no account. Stackit is bought once, and it plays with no connection at all.
Content rating
Everyone
Learn more

App support

About the developer
REplusminus GmbH
ceo@replusminus.com
Chamerstrasse 12C 6300 Zug Switzerland
+41 78 734 70 25

More by Frank Pimenta