Only 1 colour per line: will you fill in the grid? The idea is super easy, it somewhat like a Sudoku game: you have to fill the grid however, you can just place the identical colour just once on each line. Are you intelligent enough to perform with this colour game?
You want to reevaluate correctly and place only the exact same colour per line.
You need to analyse properly and put only one of the same color per line.