Spellstack app icon: a tube of letter tiles spelling CAT

Spellstack

Word sort puzzle for Android

Pour letters between tubes until every tube spells a real word. Spellstack plays like water sort or ball sort, with letters instead of colors. A tube only locks when it spells a target word, read from bottom to top.

Five hundred campaign puzzles, a Daily word puzzle, and a 60-second Blitz. Play offline. No account.

Get Spellstack on Google Play

How to play

FAQ

What is Spellstack?
An Android word puzzle where you pour letters in tubes to spell words.
Is it like water sort?
Yes. Same pour mechanic; tubes lock only when they spell a real word.
Does it work offline?
Yes. Ads and privacy choices need the internet. The puzzles do not.
Who is it for?
A mixed audience 13 and older. Family-friendly, not directed at children under 13.
Is Spellstack free?
Yes. Free to play. Optional rewarded ads can pay for hints. Occasional interstitial ads appear after campaign clears, and an app-open ad may show after you finish five levels.

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