Tile Chain by Arthur Davidian Free

 

The object in Tile Chain is to slide the tiles to their respective goals.  Important: all the tiles must always be connected. 

There's a  little sokoban feel to this game, but not quite. You can fiddle around and maybe solve some levels. Eventually, you'll have to bear down and plan.

There are only 24 levels and the first 9 are free.  After that: $.99. Definitely worth it.  At the moment, I'm stuck on level 19. Tile Chain is a little gem.
https://itunes.apple.com/ru/app/tile-chain/id1031222028?mt=8

I always save the best game for Friday.