Modeling Golf Ball in simple way

1. Create a box with follwing parameters.
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2. Now apply spherify modifier on it with 100% value, and convert it into editable poly.
3. By selecting the polygon selection select all the polygons, and apply inset with the following setting:

Our object now look like this .

4. With the same selection apply Extrude with these setting.

5. Now apply Turbosmooth modifier with Iteration 2, and our golf ball is ready .

You may also use Geospher in place of box for different ball shapes.