1. You see that you have to match the white block with the mixed block as there's no other option.
2. Due to the force fields, it is impossible to match the black blocks with each other. Because of this, you have to match the black blocks with the mixed block as well.
3. Knowing you have to match the mixed block with every other block at the same time, there's only one possible position to do that. Find that position and maneuver the blocks to that position so that the blocks don't get matched before.