Colors SPOJ Problems based on difficulty.
Visit any user profile and see all SPOJ Problems colored with a different shade of red(0-255) , So brighter red (ie higher value of r in rgb) indicates tougher problem and darker indicates easier.
I guess there were similar tools earlier, I couldn’t find on webstore so created a new one.
I kept the background requests slow to prevent getting blocked by SPOJ due to too many requests.