Blendoku is a free puzzle video game for Android and iOS mobile devices. In Blendoku, players are given a grid of squares, some with colors provided, some not. A palette of additional color tiles is provided. To clear a level, a player must "fill in" the empty squares from the palette in such a way as to create smooth sequences of colors both horizontally and vertically. The game includes 475 levels, and additional levels are available as separate purchases.