Simple Arduino memory game

Here is a tutorial for a very simple memory game that flashes a sequence of LEDs. You respond via the serial console with a list of  'r' or 'g' characters to indicate the sequence. The tutorial also shows you how to respond via a console application. There are more sophisticated arduino memory games on the web but I tried to keep this one as easy as possible as it was used in our coder dojo session.

PDF:
https://drive.google.com/file/d/0B_YZvz83_le0Vy16WUg1eVNyVjQ/view?usp=sharing

Code:
https://drive.google.com/open?id=0B_YZvz83_le0a0g0bWxPSV9xeTA