The mark consists of The mark consists of the words "Water Sort Puzzle" in black set to the right of 3 side by side representations of black test tubes that are inside a square with rounded corners, the left test tube has 3 color regions stacked at the bottom of the tube, a lowest blue region with an uneven top surface, a next yellow region on top of the blue with an uneven top, and a red region on top of the yellow, the top of the red region is uneven with representations of splashes of red thereabove, the rest of the test tube interior being white, the middle test tube is black with 3 color regions stacked at the bottom of the tube, a lowest blue region with an uneven top surface, a next green region on top of the blue with an uneven top, and a yellow region on top of the green, the top of the yellow region is uneven with representations of splashes of yellow thereabove, the rest of the test tube interior being white, the right test tube has 2 color regions stacked at the bottom of the tube, a lowest green region with an uneven top surface, and a red region on top of the green, the top of the red region is uneven with representations of splashes of red thereabove, the rest of the test tube interior being white.