Mental Calculation Challenge

1 Baseball Challenge 2 Horse Racing 3 Firefighting Challenge: Part 1 4 Firefighting Challenge: Part 2 5 Sweeper Challenge 6 Mental Calculation Challenge 7 Infinite Challenge - Master of Quiz Airs 8 Christmas Special 9 A Year-End Special 10 New Year's Day Special 11 Master of Quiz 12 Grandmother's House Special 13 Lunar New Year Special - Who Do You Want to Keep as a Pet? 14 Spring Special 15 St. Valentine's Day Special 16 School Graduation Special 17 Lee Hyori Special: Part 1 18 Lee Hyori Special: Part 2 19 Beginning School Special 20 20th Episode Special 21 Camping Special 22 April Fools' Day Special 23 Black Day Special 24 New York Special 25 China Special 26 Yi Sun-sin Birthday Special / Lee Young-ae Special Event