Read my blog here: johansenindustries.wordpress.com
Use arrow keys to move blocks left-right-and down.
Try to fill the entire screen.with blocks. However, blocks can only be next to certain other blocks:
Red: Black, red or purple
Purple: Black, red, purple, or blue
Blue: Black, blue, purple, or cyan
Cyan: Black, blue, cyan, or green
Green, Black, green or cyan