| #23801 | RingJOI 2010/2011 Preliminary Round | |
| #23802 | TileJOI 2010/2011 Preliminary Round | |
| #23803 | A First GraderJOI 2010/2011 Preliminary Round | |
| #23804 | CheeseJOI 2010/2011 Preliminary Round | |
| #23805 | JOI FlagJOI 2010/2011 Preliminary Round | |
| #23806 | Planetary ExplorationJOI 2010/2011 | |
| #23807 | BooksJOI 2010/2011 | |
| #23808 | Shopping in JOI KingdomJOI 2010/2011 | |
| #23809 | Walking SantaJOI 2010/2011 | |
| #23810 | Bug PartyJOI 2010/2011 | |
| #23811 | LunchJOI 2011/2012 Preliminary Round | |
| #23812 | SoccerJOI 2011/2012 Preliminary Round | |
| #23813 | Best PizzaJOI 2011/2012 Preliminary Round | |
| #23814 | PastaJOI 2011/2012 Preliminary Round | |
| #23815 | IlluminationJOI 2011/2012 Preliminary Round | |
| #23816 | Zig-Zag NumbersJOI 2011/2012 Preliminary Round | |
| #23817 | JJOOIIJOI 2011/2012 | |
| #23818 | Card Game is FunJOI 2011/2012 | |
| #23819 | Night MarketJOI 2011/2012 | |
| #23820 | NailsJOI 2011/2012 | |
| #23821 | Festivals in JOI KingdomJOI 2011/2012 | |
| #23822 | HomeworkJOI 2012/2013 Preliminary Round | |
| #23823 | Unique numberJOI 2012/2013 Preliminary Round | |
| #23824 | SignboardJOI 2012/2013 Preliminary Round | |
| #23825 | Hot daysJOI 2012/2013 Preliminary Round | |
| #23826 | FishJOI 2012/2013 Preliminary Round | |
| #23827 | GiftsJOI 2012/2013 Preliminary Round | |
| #23828 | IlluminationJOI 2012/2013 | |
| #23829 | Take the ‘IOI’ trainJOI 2012/2013 | |
| #23830 | Modern MansionJOI 2012/2013 | |
| #23831 | Tower of JOIOIJOI 2012/2013 | |
| #23832 | Bubble SortJOI 2012/2013 | |
| #23833 | Average ScoreJOI 2013/2014 Preliminary Round | |
| #23834 | VoteJOI 2013/2014 Preliminary Round | |
| #23835 | Super MetropolisJOI 2013/2014 Preliminary Round | |
| #23836 | ScheduleJOI 2013/2014 Preliminary Round | |
| #23837 | TaxisJOI 2013/2014 Preliminary Round | |
| #23838 | Xiao Long BaoJOI 2013/2014 Preliminary Round | |
| #23839 | Water RateJOI 2014/2015 Preliminary Round | |
| #23840 | Christmas PartyJOI 2014/2015 Preliminary Round | |
| #23841 | Weather ForecasterJOI 2014/2015 Preliminary Round | |
| #23842 | Silk RoadJOI 2014/2015 Preliminary Round | |
| #23843 | SandcastleJOI 2014/2015 Preliminary Round | |
| #23844 | TreasuresJOI 2014/2015 Preliminary Round | |
| #23845 | Selecting SubjectsJOI 2015/2016 Preliminary Round | |
| #23846 | Swapping BibsJOI 2015/2016 Preliminary Round | |
| #23847 | Russian FlagJOI 2015/2016 Preliminary Round | |
| #23848 | Walking in JOI KingdomJOI 2015/2016 Preliminary Round | |
| #23849 | Zombie IslandJOI 2015/2016 Preliminary Round | |
| #23850 | Food stallsJOI 2015/2016 Preliminary Round | |
| #23851 | MicrowaveJOI 2016/2017 Preliminary Round | |
| #23852 | Point CardJOI 2016/2017 Preliminary Round | |
| #23853 | Refreshment AreaJOI 2016/2017 Preliminary Round | |
| #23854 | Plush ToysJOI 2016/2017 Preliminary Round | |
| #23855 | RidgeJOI 2016/2017 Preliminary Round | |
| #23856 | Snake JOIJOI 2016/2017 Preliminary Round | |
| #23857 | PencilsJOI 2017/2018 Preliminary Round | |
| #23858 | SugorokuJOI 2017/2018 Preliminary Round | |
| #23859 | Trunk RoadJOI 2017/2018 Preliminary Round | |
| #23860 | MizuyokanJOI 2017/2018 Preliminary Round | |
| #23861 | DeforestationJOI 2017/2018 Preliminary Round | |
| #23862 | LthKthNumberJOI 2017/2018 Preliminary Round | |
| #23863 | Social GameJOI 2018/2019 Preliminary Round | |
| #23864 | Sugoroku and PiecesJOI 2018/2019 Preliminary Round | |
| #23865 | Circle Cross StampsJOI 2018/2019 Preliminary Round | |
| #23866 | Japan SinksJOI 2018/2019 Preliminary Round | |
| #23867 | IlluminationJOI 2018/2019 Preliminary Round | |
| #23868 | SeatsJOI 2018/2019 Preliminary Round | |
| #23869 | Three IntegersJOI 2019/2020 First Qualifying Round 1 | |
| #23870 | Counting VowelsJOI 2019/2020 First Qualifying Round 1 | |
| #23871 | MergeJOI 2019/2020 First Qualifying Round 1 | |
| #23872 | ExamJOI 2019/2020 First Qualifying Round 2 | |
| #23873 | Inversion of a StringJOI 2019/2020 First Qualifying Round 2 | |
| #23874 | ModeJOI 2019/2020 First Qualifying Round 2 | |
| #23875 | The Nearest ValueJOI 2019/2020 First Qualifying Round 3 | |
| #23876 | CapitalizationJOI 2019/2020 First Qualifying Round 3 | |
| #23877 | Longest Ascending Contiguous SubsequenceJOI 2019/2020 First Qualifying Round 3 | |
| #23878 | PosterJOI 2019/2020 Second Qualifying Round | |
| #23879 | StrawberryJOI 2019/2020 Second Qualifying Round | |
| #23880 | Digit SumJOI 2019/2020 Second Qualifying Round | |
| #23881 | TenkeyJOI 2019/2020 Second Qualifying Round | |
| #23882 | Rock-Scissors-Paper ExpressionJOI 2019/2020 Second Qualifying Round | |
| #23883 | The Second Largest IntegerJOI 2020/2021 First Qualifying Round 1 | |
| #23884 | JOI SortJOI 2020/2021 First Qualifying Round 1 | |
| #23885 | Common ElementsJOI 2020/2021 First Qualifying Round 1 | |
| #23886 | HomecomingJOI 2020/2021 First Qualifying Round 2 | |
| #23887 | Bitaro and IOIJOI 2020/2021 First Qualifying Round 2 | |
| #23888 | SplitJOI 2020/2021 First Qualifying Round 2 | |
| #23889 | CalculationJOI 2020/2021 First Qualifying Round 3 | |
| #23890 | IOI StringJOI 2020/2021 First Qualifying Round 3 | |
| #23891 | ComparisonJOI 2020/2021 First Qualifying Round 3 | |
| #23892 | Round SugorokuJOI 2020/2021 Second Qualifying Round | |
| #23893 | PancakeJOI 2020/2021 Second Qualifying Round | |
| #23894 | Event HoppingJOI 2020/2021 Second Qualifying Round | |
| #23895 | Safety InspectionJOI 2020/2021 Second Qualifying Round | |
| #23896 | Spy 2JOI 2020/2021 Second Qualifying Round | |
| #23897 | RemainderJOI 2021/2022 First Qualifying Round 1 | |
| #23898 | MovingJOI 2021/2022 First Qualifying Round 1 | |
| #23899 | Complex StringJOI 2021/2022 First Qualifying Round 1 | |
| #23900 | Boxes and KeysJOI 2021/2022 First Qualifying Round 1 | |