Color Block Sort
Object sorting with colored blocks, open spaces, and tidy grouped finishes.
Daily Stack Sort Challenge
Play today's Stack Sort puzzle: rotate the hand tile, reveal hidden colors, and complete every stack.
Need help? View rulesDaily Stack Sort
Today's Stack Sort Puzzle
Challenge #015September 10, 2026New puzzle at 00:00 UTC
Your hand
This tile enters the top of the column you choose.
Choose any active column.
Challenge complete
Best: No best yetPrevious Stack Challenges
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Stack Sort rules
- Choose any active column. The hand tile enters at the top and the bottom tile returns to your hand.
- Question tiles reveal their real color only when they reach the hand.
- An unrevealed question tile cannot complete a column.
- A full single-color column receives a green check and locks permanently.
- Complete every column with the rainbow tile in your hand.
How the daily Stack Sort challenge works
A server-generated schedule selects one of 24 replay-verified levels at 00:00 UTC. The schedule decides the puzzle; local storage only restores progress, time, best moves, and completion on this device. Stack Sort does not use a Solver in this version. See how the stored answer path and UTC schedule are checked.
Daily Challenge collection
Daily Water Sort | Daily Ball Sort | Daily Stack Sort Archive | Read the Stack Sort Guide | Compare all Daily games
FAQ
When does the puzzle change?
The challenge changes at 00:00 UTC for everyone.
Must a question tile be revealed?
Yes. It must reach the hand and reveal its real color before its column can complete.
Can a completed column move again?
No. A green completed column is permanently locked.
Does Stack Sort use a Solver?
No. Published levels are generated from reversible moves and validated by replaying a stored reference path.