Duck Stack: Build by Number

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