Kolba

Kolba is a calm ball sort puzzle. One new puzzle every day, the same one for everyone, and a journey of chapters to play at your own pace.

Move balls between glass tubes until every colour sits in a tube of its own. A group of the same colour on top moves together. Some puzzles add a jar: it holds one group at a time, locks to the first colour you put in it, and has to be empty when you finish. That one rule changes how you plan.

A journey from an atom to the universe: behind your tubes, each run of 30 chapters is one step up in scale. You start inside an atom, pass molecules, cells, a leaf, a meadow and a forest, rise above the clouds, circle the Earth and the Moon, and sort your way out to the stars, a galaxy and the whole universe. Tilt your phone and the world slides gently behind the board.

• 450 numbered chapters: finish one and the next is a tap away. Tubes, fog that hides what lies underneath, tubes of different heights, and a Challenge every tenth chapter that you can skip for now and come back to
• Soft music, off in Settings
• A new daily puzzle at midnight, the same for everyone, easiest on Monday
• Past days: every puzzle you missed waits in the archive, with no penalty
• A short tutorial that teaches by playing, not by reading
• Hints that nudge before they tell, and undo as far back as you like
• A score from your moves against par, with no timer on the daily
• A quiet month view of the days you played, with no streak to lose
• A clay or Liquid Glass look, ball styles, ball palettes and backgrounds to suit your eyes
• Colour-assist symbols, high contrast, reduced motion and VoiceOver support
• Optional Game Center leaderboards and achievements
• Optional iCloud sync of your lessons and finished days
• A widget, a Control Center control and a Siri shortcut for today's puzzle
• In English, Turkish, Spanish, Portuguese, French, German, Hindi, Russian and Indonesian

No ads. No purchases. No account. No tracking. Kolba works fully offline. Nothing goes to us: iCloud sync goes to your own iCloud, Game Center only if you turn it on.