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 ? color grid puzzle,single color per line,brain teaser,logic puzzle,color matching game,puzzle game,brain training,arcade game,sudoku alternative,number puzzle,brain exercise,color game,level puzzle,logic game,mind games,color coordination,brain workout,challenging puzzles