Turn that frown updside down, by changing the blocks into happy blocks! The green blocks change the yellow blocks into happy blocks, but you'll need to place them carefully to convert all of the blocks.
Nonograms are picture logic puzzles in which cells in a grid have to be colored or left blank according to numbers given at the side of the grid. To complete a level, you have to guess which cells must be colored or be left blank. The numbers on the rows...