Colour-sorting lab puzzle
Stack & Sort
Pour. Sort. Brew the cure.
Welcome to Professor Hoot’s lab. Pour coloured liquids from tube to tube until each one holds a single colour, then cork it. Finish a lab’s levels to brew its cure, from Hiccup Fix to Dragon Breath Drops.
Test signups open on Android
Help shape the first version. Installation opens after Google approves the test release.
How to play
One pour at a time.
Pick up a tube
Tap a tube to lift it, then tap another to pour. The top colour pours across, as much as fits, but only onto the same colour or into an empty tube.
One colour per tube
Fill a tube with a single colour and it gets a cork. Cork every colour to finish the level.
Pour with purity
Fewer pours earn more purity flasks. Replay any level from the Lab Map to beat your best.
What’s inside
Sixteen labs. Sixteen cures.
New glassware to master
Mystery liquids hidden under a question mark, frozen vials that thaw as you pour, labelled flasks, sealed flasks and big five-layer batches.
Something every day
A daily gift, a daily challenge with a streak, supply crates, and a shop of lab rooms, glitter and glowing liquids, and new glassware, all earned by playing.
Made for everyone
Undo, hints and an extra tube when you’re stuck, a warning when a level can no longer be finished, and a colour-shapes mode for colour-blind players. Progress stays on your phone; no account, no sign-in.
The game is free with ads: optional rewarded ads for extra undos, hints, an extra tube or triple coins, and an occasional full-screen ad between levels (never in the first levels and never straight after a rewarded ad). There are no purchases. Read the privacy notice for details.
Join the test
Your first cure starts here.
We’re inviting Android players to help test Stack & Sort. Use the same Google account throughout: the one you use in the Play Store.
The same tester group opens every Logic Labs game. Joining does not guarantee immediate installation; we review each request.
Join Logic Labs Testers
One Google Group covers every Logic Labs game. Open it and choose “Ask to join”; we review each request. Already a member? You’re in, so skip to step 2. You do not need to send us your email separately.
Ask to joinBecome a Play tester
Once your group request is approved and the release is available, open Google Play’s testing page and choose “Become a tester”.
Open Play testingInstall, play, tell us
Install from the link on the testing page. Brew a few cures and share what feels great or needs work. The game is free; there is nothing to buy.
Send feedback
How long should I test?
Please stay opted in for at least 14 consecutive days and play regularly during that time. Tell us about difficulty, performance, controls and anything that interrupts the fun.
What happens to my email?
Google Groups handles the request. Group owners and managers can see your membership details to manage access; the member list is hidden from other testers. Joining is for test access, not a marketing subscription. You can leave the group at any time. Read about tester privacy.
Google Play says the game is unavailable?
Check that your group request was approved and that you are using the same Google account on both sites. Changes can take a few hours to reach Google Play. If it still fails, contact us below.
Support
Need a hand?
For a Stack & Sort question or bug report, email gertodendaal@logiclabs.co.za.
Include your phone model, Android version, game version, and what happened. Screenshots are optional; remove personal information before sharing. Never send passwords or account credentials.
Privacy and data questions