.Connect. comes from Kishor Berde.  Recently I blogged about Kishor's other game SARKWO. I liked it so much I thought I'd try his other game.
The object is to swap adjacent marbles one at a time until similar colored marbles are all grouped together within a certain # of moves.

The first 20 levels were so easy and I wondered why I was still playing.  But gradually, new elements were being added and things got more interesting. 

The black squares with a marble: they're fixed. The black squares with multiple colors (see the third image) can be rotated.
The connecting lines have their own button not attached: tap on it and the corresponding buttons will swap.

There are 170 levels and at the moment I've done 87 levels. I did these all on my phone while killing time. 

Advice to all puzzle app developers: Don't publish more than 100 levels.  https://apps.apple.com/us/app/connect/id1416467796

...