| #19601 | Equals are EqualsKanazawa Regional 2002 | |
| #19602 | GIGA Universe CupKanazawa Regional 2002 | |
| #19603 | Life LineKanazawa Regional 2002 | |
| #19604 | Map of Ninja HouseKanazawa Regional 2002 | |
| #19605 | Shredding CompanyKanazawa Regional 2002 | |
| #19606 | True LiarsKanazawa Regional 2002 | |
| #19607 | Viva ConfettiKanazawa Regional 2002 | |
| #19608 | Unreliable MessengersAizu Regional 2003 | |
| #19609 | Lagrange's Four-Square TheoremAizu Regional 2003 | |
| #19610 | Area of PolygonsAizu Regional 2003 | |
| #19611 | Weather ForecastAizu Regional 2003 | |
| #19612 | Molecular FormulaAizu Regional 2003 | |
| #19613 | GapAizu Regional 2003 | |
| #19614 | Concert Hall SchedulingAizu Regional 2003 | |
| #19615 | Monster TrapAizu Regional 2003 | |
| #19616 | How I Wonder What You Are!Yokohama Regional 2006 | |
| #19617 | How I Mathematician Wonder What You Are!Yokohama Regional 2006 | |
| #19618 | Cubic Eight-PuzzleYokohama Regional 2006 | |
| #19619 | Sum of Different PrimesYokohama Regional 2006 | |
| #19620 | Manhattan WiringYokohama Regional 2006 | |
| #19621 | Power CalculusYokohama Regional 2006 | |
| #19622 | Polygons on the GridYokohama Regional 2006 | |
| #19623 | The Best Name for Your BabyYokohama Regional 2006 | |
| #19624 | Enjoyable CommutationYokohama Regional 2006 | |
| #19625 | And Then There Was OneTokyo Regional 2007 | |
| #19626 | Prime GapTokyo Regional 2007 | |
| #19627 | Minimal BackgammonTokyo Regional 2007 | |
| #19628 | Lowest PyramidTokyo Regional 2007 | |
| #19629 | Geometric MapTokyo Regional 2007 | |
| #19630 | Slim SpanTokyo Regional 2007 | |
| #19631 | The Morning after HalloweenTokyo Regional 2007 | |
| #19632 | Bug HuntTokyo Regional 2007 | |
| #19633 | Most Distant Point from the SeaTokyo Regional 2007 | |
| #19634 | The Teacher's Side of MathTokyo Regional 2007 | |
| #19635 | Grey AreaAizu Regional 2008 | |
| #19636 | Expected AllowanceAizu Regional 2008 | |
| #19637 | Stopped WatchesAizu Regional 2008 | |
| #19638 | Digits on the FloorAizu Regional 2008 | |
| #19639 | Spherical MirrorsAizu Regional 2008 | |
| #19640 | Traveling CubeAizu Regional 2008 | |
| #19641 | Search of Concatenated StringsAizu Regional 2008 | |
| #19642 | Top SpinningAizu Regional 2008 | |
| #19643 | Common PolynomialAizu Regional 2008 | |
| #19644 | ZigzagAizu Regional 2008 | |
| #19645 | Cubist ArtworkTokyo Regional 2009 | |
| #19646 | Repeated Substitution with SedTokyo Regional 2009 | |
| #19647 | Swimming JamTokyo Regional 2009 | |
| #19648 | Separate PointsTokyo Regional 2009 | |
| #19649 | Origami Through-HoleTokyo Regional 2009 | |
| #19650 | Chemist's MathTokyo Regional 2009 | |
| #19651 | Malfatti CirclesTokyo Regional 2009 | |
| #19652 | Twenty QuestionsTokyo Regional 2009 | |
| #19653 | Hobby on RailsTokyo Regional 2009 | |
| #19654 | Infected LandTokyo Regional 2009 | |
| #19655 | Modern ArtNWERC 1995 | |
| #19656 | Bank (Not Quite O.C.R.)NWERC 1995 | |
| #19657 | Matty's BlocksNWERC 1995 | |
| #19658 | Block VotingNWERC 1995 | |
| #19659 | DonkeyNWERC 1995 | |
| #19660 | IslandsNWERC 1995 | |
| #19661 | MazeNWERC 1995 | |
| #19662 | SyntraxNWERC 1995 | |
| #19663 | BurgerNWERC 1996 | |
| #19664 | WormholesNWERC 1996 | |
| #19665 | SquaresNWERC 1996 | |
| #19666 | MagicNWERC 1996 | |
| #19667 | JackpotNWERC 1996 | |
| #19668 | Dividing coinsNWERC 1996 | |
| #19669 | CrimewaveNWERC 1996 | |
| #19670 | GastonNWERC 1996 | |
| #19671 | ArrowsNWERC 1997 | |
| #19672 | MDST-machineNWERC 1997 | |
| #19673 | EntropyNWERC 1997 | |
| #19674 | ColumnsNWERC 1997 | |
| #19675 | InternetNWERC 1997 | |
| #19676 | GardenerNWERC 1997 | |
| #19677 | MendelNWERC 1997 | |
| #19678 | Hall of FlamesNWERC 1997 | |
| #19679 | Space ManagementNWERC 1998 | |
| #19680 | Plane SpottingNWERC 1998 | |
| #19681 | KroketNWERC 1998 | |
| #19682 | Psychic YahtzeeNWERC 1998 | |
| #19683 | Super SnookerNWERC 1998 | |
| #19684 | InversoNWERC 1998 | |
| #19685 | MondriaanNWERC 1998 | |
| #19686 | Numbers & LettersNWERC 1998 | |
| #19687 | Splitting PeasNWERC 1999 | |
| #19688 | Love You, Disney WorldNWERC 1999 | |
| #19689 | Chess x TetrisNWERC 1999 | |
| #19690 | Dungeon of DoomNWERC 1999 | |
| #19691 | Papergirl ParadiseNWERC 1999 | |
| #19692 | Basically BooleanNWERC 1999 | |
| #19693 | Bits of TrinityNWERC 1999 | |
| #19694 | Land LordsNWERC 1999 | |
| #19695 | RailroadsNWERC 2000SWERC 2000 | |
| #19696 | Ouroboros SnakeNWERC 2000SWERC 2000 | |
| #19697 | Vito's FamilyNWERC 2000SWERC 2000 | |
| #19698 | Smith NumbersNWERC 2000SWERC 2000 | |
| #19699 | Chainsaw MassacreNWERC 2000SWERC 2000 | |
| #19700 | Erdős NumbersNWERC 2000SWERC 2000 | |