Buddy! This is cool, that too coming from Reserve Bank of India. A nice little game on the Indian currency notes and a decent description of the security features of the notes
This is a must-have link for many for whom stickcricket, orkut, gmail, cricinfo etc. are blocked. The best part is that Rs.10 note is at a difficulty level of a novice while Rs.1000 note at 'insane' level.