putting 'X' in all grids before you start solving the puzzle is very helpful.. then only you start filling the box with blocks.. the numbers in each row/column will turn grey if you put the blocks correctly.. bear in mind that the numbers will only turn grey if you put the blocks correctly and all the boxes had been filled in that row/column.. the 'X' will fill the empty boxes that are not the right place for the blocks to be filled.. even if you put the blocks correctly in that row/column, it will not turn grey as there are still empty boxes in that row/column.. it helps me a lot.. great game..
 "NoNoSparks: Genesis"){kind=icon}
 "Ragdoll Cannon Four"){kind=icon}