Turn all the tiles into green grass by drawing a continuous line to flip the tiles. You can use the hint if you're not sure where to start the line. You can't cross the created line, go through the same path twice or move diagonally. Make sure you chose the right cell to begin with.
Minimum Requirements:
Windows 7/8/10 Macintosh OS X 800 MHz processor 1 GB RAM 128 MB video RAM