Blendoku is a free[1] puzzle video game for Android and iOS mobile devices[2] developed by Los Angeles–based studio Lonely Few, which was founded by Australian developer Rod Green and Yeong-Hao Han.

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.

[4] Green and Han acknowledged that the game is not accessible to people with a variety of types of color-blindness and were working on a solution.

[1] Gamezebo called it "A brilliantly simple yet challengingly in-depth twist on classic Sudoku."

but stated that it's a "tablet game" because many puzzles are too small to play on a phone,[5]