Some puzzles reward speed; Slide Puzzle rewards neatness. You drag blocks into the right places, one move after another, and each level is solved best with as few moves as possible. Completing rows triggers little special effects and scores points.
The levels get more intricate as you go, and there is no time pressure, so it is a good game for patient players. Find the blocks that stand directly in the way, work out the order from the end, and restart a level if you have wasted too many moves. It is played with the mouse or touch. 1010 Deluxe asks for similar planning.