Children stack and colour virtual DUPLO bricks, build and drive trains, rescue animals, run a house or a farm, and explore themed play packs; every scene is a tap-and-drag toy with characters that react, and there is no losing.
Why it may be useful
Toddlers get real practice in placing a brick where they mean to, sorting by color or size, and following a short sequence such as laying track before a train runs. Much of each scene, though, is watching an animation once you tap it.
Keep in mind
The free download includes only a few scenes; most play packs are locked behind in-app purchases or a subscription, and the locked content is visible to the child using it.
Written 2026-09-15 · editorial assessment, not a measured effect · how we rate →
What the game is
LEGO DUPLO World is a tablet and phone app for very young children, made by StoryToys and released in 2019. It is a box of digital DUPLO: chunky three-dimensional bricks that can be dragged, stacked and recolored, wrapped in a set of themed scenes.
StoryToys lists packs including a Number Train, Rescue Adventures, a Play House, a Construction Site, Under the Sea, a Farm, Food Fun, World Animals and a Winter Holiday. In each one a child taps and drags: building a train and driving it, sorting bricks by color or size, knocking a wall down with a wrecking ball, digging, feeding animals, putting a family to bed. Characters answer with sounds and small animations. Nothing is timed, nothing is scored, and nothing can be lost.
The money matters here. The app is free to download and carries no advertising, but only part of the catalog is open; the rest is unlocked by in-app purchase or subscription. A separate listing, LEGO DUPLO World+, comes with an Apple Arcade subscription and includes the same content without purchases. StoryToys gives the age range as two to five and lists a KAPI Best App award from 2020.
What you actually do
A child touches a brick and it lifts; they drag it near another and it clicks on. That is most of the app. Around it sit small pretend-play routines: lay the track before the train can run, put the right number of candles on the cake, match an animal to where it lives, use the digger before the truck can be loaded.
Each activity is a loop of a few actions that can be repeated as long as the child wants. The app never fails anybody and never blocks the way forward, so what happens next is whatever gets touched. Getting better looks like a two-year-old who was patting the screen starting to put a brick where they meant to, and a four-year-old finishing a sequence, track then carriage then go, before something else catches their eye.
What it exercises
Places a brick deliberately on a target rather than tapping at random
Sorts objects by color, size or kind
Counts small quantities by touching each item once
Follows a two or three step sequence to make something happen
Repeats an action and watches what changes, which is early cause and effect
Why we rate it Minimal Worksheet score 33 / 100
FitHow much real knowledge or skill does the play itself make you use?30weight 45%
Fit sits at 30. Building and sorting are what a toddler actually does with their hands, so the useful part sits inside the play rather than beside it. It stays low because a good deal of each scene is watching: a tap sets off an animation that then runs on its own, well past the point of purposeful building.
TransferWill what you practise here work outside the game?28weight 30%
Transfer is the lowest mark at 28, and honestly so. Dragging a flat image of a brick is not the same as fitting a real one, which is where hand strength and fine control actually develop, and counting on a screen that corrects you instantly is easier than counting real objects on a table.
PracticeDoes the game make you use that skill again and again, as it gets harder?45weight 25%
Practice reaches 45. Small children repeat things happily, and every scene replays with nothing to reset, so the same building and sorting continues for as long as interest holds. Each pack, though, is only a handful of activities, and once they have all been seen, new material means buying another pack.
What the evidence says
Editorial onlyNobody outside our desk has checked this. It is our reading of how the game plays.
The evidence level here is editorial only. The two sources, the StoryToys product page and the App Store listing, confirm the developer, the 2019 release, the two-to-five age range, the named play packs and what happens inside them, the absence of advertising, the free download with in-app purchases, the Apple Arcade variant and a KAPI Best App award from 2020. StoryToys also states that each activity is designed to support early learning goals aligned with the Head Start Early Learning Outcomes Framework. That is a statement about design intent by the people selling the app, not a measurement of any outcome, which is why the level stays editorial. We cite no study and know of none on this app.
Editorial assessment - not a measured scientific effect.
Fit
30/100
Transfer
28/100
Practice
45/100
Why it makes the cut
It is a digital brick box with vehicles and animals; children play it for the trains and the silliness, and the learning framing is StoryToys' description of what happens along the way.
Editorial only
This rating is editorial only. StoryToys states its activities align with the Head Start Early Learning Outcomes Framework, which is the seller's own claim about design intent, not an independent measurement, so the level stays editorial.
Prices are US store listings in USD, last refreshed 2026-09-25; regional prices and sales differ.
StoryToys describes the app as for 2-5 year olds, lists a KAPI Best App award (2020), and says the activities are aligned with the Head Start Early Learning Outcomes Framework.
A separate LEGO DUPLO World+ listing exists for Apple Arcade subscribers with the same content and no in-app purchases.
Age guidance
Ages 2-5
Topics
Creativity
Play styles
Single-player, Co-op, Sandbox, Creative
Tags
No reading · Ad-free · In-app purchases · Shared tablet play · Building
Dragging a flat picture of a brick and watching it click into place is simple enough for a two-year-old, but much of each scene runs on its own once tapped, so purposeful building is only part of what happens.
