Spending time with mahjong solitaire is not a waste of time. You will not only relax, but also train your powers of observation. The game Mahjong Lines is one of the best representatives of this genre. It has a gorgeous, colorful interface with large tiles with bright, expressive designs on them. To complete the level you need to remove all the tiles from the field. To do this, look for pairs of identical free tiles that you can pick up. If clicking on tiles turns them red, that item is not available in Mahjong Lines.