Domino blocks in different shades of one color are your pieces in Domino Shades, a puzzle from the Famobi studio. You drag them onto the board, place same-colored ones next to each other and fill complete rows and columns to clear them.
The idea is easy to grasp; the challenge is space. Every domino you place takes room, and a board that fills up with mixed shades is hard to rescue. When no domino fits any more, the game is over, so the real task is to keep the board as empty as you can for as long as you can. Build one color in one area, keep room for both vertical and horizontal pieces, and clear several lines at once whenever possible. 1010 Deluxe is the nearest cousin.