We are bidding farewell to cl XII, Could you please suggest games we could organise?

I require an answer before 10pm today, We are of cl XI and we require games that are require activeness, alertness of the participants (in this case the cl XII students) and a certain amount of skill. The game should ideally be fun, informative, entertaining and last but not the least...memorable! We require 3 games. Games such as musical chairs, antaakshari, dumb charades etc are too common...we are looking for games that are unique and different from the stereotypical ones.