Sort the balls.
Take your time.
Kolba is a calm ball sort puzzle for iPhone. Move balls between glass tubes until every colour has a tube of its own. One new puzzle every day, the same for everyone.
Download on the App StoreFree · iPhone · iOS 26 or later
Why it feels different
Balls that feel good to touch
Matte, weighty balls that lift, travel and settle, each with a small haptic. No gloss, no confetti.
One puzzle a day
A new daily puzzle at midnight, the same for everyone, with no timer and no streak to lose. Plus 300 numbered chapters and free play.
Race a friend
Send a link and play the same board. No account needed on either side.
The jar rule
Some puzzles add a jar that holds one colour at a time and must be empty at the end. One rule that changes how you plan.
Gentle help
Hints that nudge before they tell, and undo as far back as you like.
Made to be accessible
Colour-assist symbols, high contrast, reduced motion, VoiceOver, and palettes tuned for colour blindness.
Nothing to give up
No ads. No purchases. No account. No tracking. Kolba works fully offline.
Also: a widget, a Control Center control and a Siri shortcut for today's puzzle; optional Game Center and iCloud sync; nine languages.