Mind Puzzle (Free) by Khagesh Patel is a puzzle game with an incomplete grid of circles which all have to be filled up.
The circles are either blue or orange, while the bottom are shapes made of connected circle pieces which are also colored blue or orange.
You have to use the pieces along the bottom to perfectly fill up the displayed grid. To use a piece, tap it so it is brought into the foreground. Tap it again to change its orientation if necessary then drag it to where it needs to go.
You are given 999 seconds to complete each puzzle. The number of seconds left becomes your score.
Mind Puzzle makes for some thought-provoking fun and having 34 levels in a free game isn’t bad. I suggest you try it.