you can use the halo from the start. Like a free column except you cannot take them back from halo so you need to be careful.
What about -
- drag y4 (yellow 4th column) to halo
- y4 to g1
- g1 to b4 -- the blue square piece.
- now drag all 4 of those pieces to the halo also to join with the yellow piece already there
- fairly sure with some shifting the rest could be solvable.
--- you would then have the following in the halo
