May Challenge 2012
Jewels and Stones, Lucky lucky number, Remember the recipe
June Challenge 2012
Little Elephant and Candies, Arranging Cup-cakes
August Challenge 2012
Little Elephant and Bombs
January Challenge 2013
The Minimum Number Of Moves, Three Different Numbers
March Challenge 2013
Tourist Translations, Approximately
April Challenge 2013
Maximum Weight Difference, Levy Conjecture
