July 2009 (Contest V)
Quadratic Equations, Lights Off, Sums in a cuboid, Lights Off, Revisited!, Johny the farmer, Buggy algorithm, The White Knight
October Challenge 2012
Little Elephant and Order, Fierce Battles, Event Organizer, Maximum Sub-rectangle in Matrix, Blade Master, The New Scheme, Need More Diamonds
November Challenge 2012
Sridhar Likes Travelling, Coin Flip, Candy Collecting Game, Delicious Dishes, A Wonderful Chocolate
January Challenge 2013
Little Elephant and Alcohol, The Minimum Number Of Moves, Chef of the Year
May Challenge 2013
Matchsticks, Witua and Math, Name Reduction, Your Name is Mine, Field Trip
February Challenge 2015
Chef and Chain, Time to Study Graphs with Chef, Chef and Strange Formula, Chef and Strings, Let us play with rank list, Chef and Equality
