Only One Color Per Line Home Only One Color Per Line 0.0 / 5 ( 0 votes ) Your Rating? Discover Only One Color Per Line – Play Free Now on GamePrimary! Only 1 color per line : can you fill in the grid ? The concept is super simple, it a bit like a sudoku game: you must fill the grid but you can only place the same color only once on every line. Are you smart enough to play this color game ? Categories in which Only One Color Per Line is included: Puzzle Amore 1 Giocatore Thinking