October 2009 (Contest IX)
Forces in the crystal, A puzzle game
November 2010 Challenge
Randomly Testing Circuits, Balanced Walks
September Long Contest
Younger Brother, BIT Magazine
July Cook-Off 2012
Ciel and Receipt, Ciel and Map
April Challenge 2013
Maximum Weight Difference
July Challenge 2013
Chef and Walking on the rectangle , Circle of death, Sereja and Sorting, Count K-Primes, Furik and Rubik and Sub Array, The Probability Of Winning, Galactik Football, Mountain Holidays
September Challenge 2013
Little Elephant and Exams, Cool Guys, Chef and Integers , Project Spoon, CAO Stage-1, CAO Stage-2
October Challenge 2013
Helping Lira, Maxim and Dividers
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle
Canada