January Challenge 2019 Division 2
Lucky Number Game, Different Neighbours, Fancy Quotes, Distinct Pairs, Chef and Modulo Game
February Challenge 2019 Division 2
Manhattan Rectangle, Guess It Right, Chef and Magical Jars, Chef and Secret Ingredients, Appy and Contest, Art of Balance, Deputy Chef
March Challenge 2019 Division 2
Chef and Number Game, Chef and a Beautiful Digit, Chef got Recipes
April Challenge 2019 Division 2
Friend or Girlfriend, Maximum Remaining, Fencing
May Challenge 2019 Division 2
Matches, Reduce to One, Where to Build the Roads
June Challenge 2019 Division 2
Sum and GCD, Chef and Ingredients, Guddu on a Date, Road Signs, Chef and Proxy
July Challenge 2019 Division 2
Parity Again, Minimum and Maximum, Chef and Mean
August Challenge 2019 Division 2
Guddu and his Mother, Dilemma, Football, Distribute Apples, Zombie and the Caves
September Challenge 2019 Division 2
Easy Fibonacci, Chef and Interesting Subsequences , Chef Designed a Network, Chef and Good Subsequences
October Challenge 2019 Division 1
Chef and Maximum Star Value, Array Modification
November Challenge 2019 Division 2
Hard Sequence, A Simple Game, Weapon Value
December Challenge 2019 Division 2
Plus Multiply, Easy Subsequence Selection, That Is My Score!
Japan