Grid Grade - A spatial intelligence challenge

The objective is to get all boxes in the 3 x 3 gird yellow
The objective is to get all boxes in the 3 x 3 gird yellow with the shortest number of taps and in the shortest time you can. When you tap a box in the grid, the box and all the others surrounding it invert (from grey to yellow or vice versa).

Download Grid Grade - A spatial intelligence challenge 1.0.0:

Current Version: 1.0.0
Installs: 100+
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Requirements: 4.1+
Content Rating: Everyone
Package name: com.MajorE.GridGrade