Duck Stack: Build by Number

In-app purchases
Content rating
Everyone
5+
Downloads
Content rating
Everyone
In-Game Purchases
Learn more
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About this game

Duck Stack turns a sticker-by-number book into a box of blocks.

Pick a model and build it from the ground up, one layer at a time. Each layer shows numbered tiles where blocks go. Tap a number in the tray, tap the matching tiles, and the blocks drop into place with a happy pop. Finish a layer and the next one appears. Finish the model, watch it spin, and put it on your shelf.

MADE FOR SMALL HANDS
- Big buttons and big tiles, and no reading needed to play
- Numbers always show which block goes where, so colour-blind builders are never stuck
- A hint wand shows where the next block goes, as often as you like
- Little Builder mode for the youngest: any tile places the right block
- Sums mode for older builders: a tile shows 2+1, the block shows 3
- No timers, no lives, no losing. Just building.

MORE THAN BUILDING
- Paint finished models in new colours
- Set them out in a meadow playground and watch them come alive
- Free build: stack blocks into anything you can imagine

PACKS OF MODELS
Animals, things that go, yummy treats, dinosaurs, sea creatures, farm animals and more, from quick first builds to bigger ones. A set of models is free to build, including the whole Starter pack.

FOR GROWN-UPS
- No ads, ever
- Collects nothing: no accounts, no analytics, no tracking, and it works offline
- Purchases, settings and the small print sit behind a grown-ups gate
- Unlock the Whole Book is a single one-time in-app purchase. It opens every model in the book and as many Free build creations as you like. No subscription, nothing renews.
- New packs added later may be sold on their own. Anything already unlocked stays unlocked.
- Restore purchases any time from the Grown-ups area
Build 3D block models layer by layer. Tap a number, tap the tiles. No ads, ever.
Updated on
Oct 28, 2026

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
  • No data collected
    Learn more about how developers declare collection
  • Committed to follow the Play Families Policy

What’s new

v1.0.1
- Improved navigation between categories
- Modified brick orientation in Free build
- Updated models
Content rating
Everyone
In-Game Purchases
Learn more

App support

Phone number
+12489878001
About the developer
RUTHLESS GAMES LLC
support@ruthless-games.com
1893 Humphrey Ave Birmingham, MI 48009-7154 United States
+1 248-987-8001

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