| #20501 | FriendsCCC-S 2007 | |
| #20502 | WaterparkCCC-S 2007 | |
| #20503 | Bowling for NumbersCCC-S 2007 | |
| #20504 | The New CCC (Canadian Calorie Counting)CCC-J 2006 | |
| #20505 | Roll the DiceCCC-J 2006 | |
| #20506 | Cell-Phone MessagingCCC-J 2006 | |
| #20507 | It’s tough being a teen!CCC-J 2006 | |
| #20508 | CCC OthelloCCC-J 2006 | |
| #20509 | MaternityCCC-S 2006 | |
| #20510 | Attack of the CipherTextsCCC-S 2006 | |
| #20511 | Tin Can TelephoneCCC-S 2006 | |
| #20512 | GroupsCCC-S 2006 | |
| #20513 | Origin of LifeCCC-S 2006 | |
| #20514 | The Cell SellCCC-J 2005 | |
| #20515 | RSA NumbersCCC-J 2005 | |
| #20516 | Returning HomeCCC-J 2005 | |
| #20517 | Cross SpiralCCC-J 2005 | |
| #20518 | BananasCCC-J 2005 | |
| #20519 | Snow CallsCCC-S 2005 | |
| #20520 | Mouse MoveCCC-S 2005 | |
| #20521 | Quantum OperationsCCC-S 2005 | |
| #20522 | Pyramid Message SchemeCCC-S 2005 | |
| #20523 | Pinball RankingCCC-S 2005 | |
| #20524 | SquaresCCC-J 2004 | |
| #20525 | Terms of OfficeCCC-J 2004 | |
| #20526 | Smile with similesCCC-J 2004 | |
| #20527 | A Simple Encryption AlgorithmCCC-J 2004 | |
| #20528 | FractalsCCC-J 2004 | |
| #20529 | FixCCC-S 2004 | |
| #20530 | TopYodellerCCC-S 2004 | |
| #20531 | SpreadsheetCCC-S 2004 | |
| #20532 | Space TurtleCCC-S 2004 | |
| #20533 | Super PlumberCCC-S 2004 | |
| #20534 | TridentCCC-J 2003 | |
| #20535 | Picture PerfectCCC-J 2003 | |
| #20536 | Snakes and LaddersCCC-J 2003 | |
| #20537 | PoetryCCC-J 2003 | |
| #20538 | Floor PlanCCC-J 2003 | |
| #20539 | Snakes and LaddersCCC-S 2003 | |
| #20540 | PoetryCCC-S 2003 | |
| #20541 | Floor PlanCCC-S 2003 | |
| #20542 | SubstringsCCC-S 2003 | |
| #20543 | Trucking TroublesCCC-S 2003 | |
| #20544 | Seven Segment DisplayCCC-J 2002 | |
| #20545 | AmeriCanadianCCC-J 2002 | |
| #20546 | The Students’ Council BreakfastCCC-J 2002 | |
| #20547 | Fraction ActionCCC-J 2002 | |
| #20548 | BlindfoldCCC-J 2002 | |
| #20549 | The Students’ Council BreakfastCCC-S 2002 | |
| #20550 | Fraction ActionCCC-S 2002 | |
| #20551 | BlindfoldCCC-S 2002 | |
| #20552 | Bridge CrossingCCC-S 2002 | |
| #20553 | Follow the Bouncing BallCCC-S 2002 | |
| #20554 | Dressing UpCCC-J 2001 | |
| #20555 | Mod InverseCCC-J 2001 | |
| #20556 | Keeping ScoreCCC-J 2001 | |
| #20557 | SpiralsCCC-J 2001 | |
| #20558 | Strategic BombingCCC-J 2001 | |
| #20559 | Keeping ScoreCCC-S 2001 | |
| #20560 | SpiralsCCC-S 2001 | |
| #20561 | Strategic BombingCCC-S 2001 | |
| #20562 | CookiesCCC-S 2001 | |
| #20563 | Post's Correspondence ProblemCCC-S 2001 | |
| #20564 | CalendarCCC-J 2000 | |
| #20565 | 9966CCC-J 2000 | |
| #20566 | Slot MachinesCCC-J 2000 | |
| #20567 | Babbling BrooksCCC-J 2000 | |
| #20568 | Surfin'CCC-J 2000 | |
| #20569 | Slot MachinesCCC-S 2000 | |
| #20570 | Babbling BrooksCCC-S 2000 | |
| #20571 | Surfin'CCC-S 2000 | |
| #20572 | GolfCCC-S 2000 | |
| #20573 | Sheep and CoyotesCCC-S 2000 | |
| #20574 | Card GameCCC 1999 | |
| #20575 | Year 2000CCC 1999 | |
| #20576 | Divided FractalsCCC 1999 | |
| #20577 | A Knightly PursuitCCC 1999 | |
| #20578 | Letter ArithmeticCCC 1999 | |
| #20579 | CensorCCC 1998 | |
| #20580 | Cross-Number PuzzleCCC 1998 | |
| #20581 | Mars RoverCCC 1998 | |
| #20582 | LotteryCCC 1998 | |
| #20583 | Mountain PassageCCC 1998 | |
| #20584 | SentencesCCC 1997 | |
| #20585 | Nasty NumbersCCC 1997 | |
| #20586 | Double Knockout CompetitionCCC 1997 | |
| #20587 | Dynamic Dictionary CodingCCC 1997 | |
| #20588 | Long DivisionCCC 1997 | |
| #20589 | Deficient, Perfect, and AbundantCCC 1996 | |
| #20590 | Divisibility by 11CCC 1996 | |
| #20591 | Pattern GeneratorCCC 1996 | |
| #20592 | When in Rome...CCC 1996 | |
| #20593 | Maximum DistanceCCC 1996 | |
| #20594 | All Your Base Belong to PalindromesCCO 2013 Day 1 | |
| #20595 | TourneyCCO 2013 Day 1 | |
| #20596 | LHCCCO 2013 Day 1 | |
| #20597 | A Romantic Movie OutingCCO 2013 Day 2 | |
| #20598 | Transforming CometsCCO 2013 Day 2 | |
| #20599 | RepetitivityCCO 2013 Day 2 | |
| #20600 | Choose Your Own ArithmeticCCO 2012 Day 1 | |