| #22401 | Hide and SeekUSACO 2009 US Open Silver | |
| #22402 | Cow LineUSACO 2009 US Open Silver | |
| #22403 | Cow Digit GameUSACO 2009 US Open Silver | |
| #22404 | Grazing2USACO 2009 US Open Silver | |
| #22405 | Ski LessonsUSACO 2009 US Open Gold | |
| #22406 | Work SchedulingUSACO 2009 US Open Gold | |
| #22407 | Tower of HayUSACO 2009 US Open Gold | |
| #22408 | Bovine EmbroideryUSACO 2009 US Open Gold | |
| #22409 | Even? Odd?USACO 2009 October Gold | |
| #22410 | The Robot PlowUSACO 2009 October Gold | |
| #22411 | Barn EchoesUSACO 2009 October Gold | |
| #22412 | Papaya JungleUSACO 2009 October Gold | |
| #22413 | The Leisurely StrollUSACO 2009 October Gold | |
| #22414 | Invasion of the MilkweedUSACO 2009 October Gold | |
| #22415 | AllowanceUSACO 2009 October Gold | |
| #22416 | Bessie's Weight ProblemUSACO 2009 October Gold | |
| #22417 | Heat WaveUSACO 2009 October Gold | |
| #22418 | Claustrophobic CowsUSACO 2009 November Bronze | |
| #22419 | The Chivalrous CowUSACO 2009 November Bronze | |
| #22420 | Cow PinballUSACO 2009 November Bronze | |
| #22421 | A Coin GameUSACO 2009 November Silver | |
| #22422 | The Grand Farm-offUSACO 2009 November Silver | |
| #22423 | Job HuntUSACO 2009 November Silver | |
| #22424 | Who Brings the Cookies?USACO 2009 November Gold | |
| #22425 | LightsUSACO 2009 November Gold | |
| #22426 | Cow RescueUSACO 2009 November Gold | |
| #22427 | The Big DanceUSACO 2009 December Bronze | |
| #22428 | Lonesome PartnersUSACO 2009 December Bronze | |
| #22429 | Shorter Musical NotesUSACO 2009 December Bronze | |
| #22430 | BobsleddingUSACO 2009 December Silver | |
| #22431 | Music NotesUSACO 2009 December Silver | |
| #22432 | Selfish GrazingUSACO 2009 December Silver | |
| #22433 | Dizzy CowsUSACO 2009 December Gold | |
| #22434 | Cow Toll PathsUSACO 2009 December Gold | |
| #22435 | Video Game TroublesUSACO 2009 December Gold | |
| #22436 | Cow PoliticsUSACO 2010 Holiday Bonus Gold | |
| #22437 | Rocks and TreesUSACO 2010 Holiday Bonus Gold | |
| #22438 | Driving Out the PiggiesUSACO 2010 Holiday Bonus Gold | |
| #22439 | Cow WarUSACO 2010 Holiday Bonus Gold | |
| #22440 | DNA SequencingUSACO 2010 January Bronze | |
| #22441 | Theater SeatingUSACO 2010 January Bronze | |
| #22442 | Word MorphUSACO 2010 January Bronze | |
| #22443 | Tea TimeUSACO 2010 January Silver | |
| #22444 | Buying Feed, IIUSACO 2010 January Silver | |
| #22445 | Cheese TowersUSACO 2010 January Silver | |
| #22446 | Taking TurnsUSACO 2010 January Gold | |
| #22447 | Shipping Around an IslandUSACO 2010 January Gold | |
| #22448 | Cow TelephonesUSACO 2010 January Gold | |
| #22449 | Scavenger HuntUSACO 2010 February Bronze | |
| #22450 | Feeding TimeUSACO 2010 February Bronze | |
| #22451 | Toy ShoppingUSACO 2010 February Bronze | |
| #22452 | Chocolate BuyingUSACO 2010 February Silver | |
| #22453 | Chocolate GivingUSACO 2010 February Silver | |
| #22454 | Chocolate EatingUSACO 2010 February Silver | |
| #22455 | Covering the CorralUSACO 2010 February Gold | |
| #22456 | Cows on IceUSACO 2010 February Gold | |
| #22457 | Slowing downUSACO 2010 February Gold | |
| #22458 | Need For SpeedUSACO 2010 March Bronze | |
| #22459 | Hexadecimal ConversionUSACO 2010 March Bronze | |
| #22460 | MasterMindUSACO 2010 March Bronze | |
| #22461 | Longest Contiguous SubsequenceUSACO 2010 March Bronze | |
| #22462 | The Rock GameUSACO 2010 March Silver | |
| #22463 | Test TakingUSACO 2010 March Silver | |
| #22464 | Need For SpeedUSACO 2010 March Silver | |
| #22465 | Great Cow GatheringUSACO 2010 March Gold | |
| #22466 | Barn AllocationUSACO 2010 March Gold | |
| #22467 | StarCowraftUSACO 2010 March Gold | |
| #22468 | Cow PalsUSACO 2010 US Open Bronze | |
| #22469 | Mountain WatchingUSACO 2010 US Open Bronze | |
| #22470 | Relay raceUSACO 2010 US Open Bronze | |
| #22471 | Cow TypingUSACO 2010 US Open Bronze | |
| #22472 | Cows in TreesUSACO 2010 US Open Silver | |
| #22473 | Mountain WatchingUSACO 2010 US Open Silver | |
| #22474 | Time TravelUSACO 2010 US Open Silver | |
| #22475 | Cow HopscotchUSACO 2010 US Open Gold | |
| #22476 | Water SlidesUSACO 2010 US Open Gold | |
| #22477 | Triangle CountingUSACO 2010 US Open Gold | |
| #22478 | Interactive Guess my NumberUSACO 2010 October Bronze | |
| #22479 | Counting BeadsUSACO 2010 October Bronze | |
| #22480 | Dinner TimeUSACO 2010 October Silver | |
| #22481 | Lake CountingUSACO 2010 October Silver | |
| #22482 | Making MoneyUSACO 2010 October Gold | |
| #22483 | Soda MachineUSACO 2010 October Gold | |
| #22484 | Daisy Chains in the FieldUSACO 2010 November Bronze | |
| #22485 | Race ResultsUSACO 2010 November Bronze | |
| #22486 | Math PracticeUSACO 2010 November Bronze | |
| #22487 | BannerUSACO 2010 November Silver | |
| #22488 | CandyUSACO 2010 November Silver | |
| #22489 | Chocolate MilkUSACO 2010 November Silver | |
| #22490 | Cow PhotographsUSACO 2010 November Gold | |
| #22491 | Buying FeedUSACO 2010 November Gold | |
| #22492 | Visiting CowsUSACO 2010 November Gold | |
| #22493 | Book ClubUSACO 2010 December Bronze | |
| #22494 | Bad Random NumbersUSACO 2010 December Bronze | |
| #22495 | Adding CommasUSACO 2010 December Bronze | |
| #22496 | Apple DeliveryUSACO 2010 December Silver | |
| #22497 | Treasure ChestUSACO 2010 December Silver | |
| #22498 | The Trough GameUSACO 2010 December Silver | |
| #22499 | Cow CalisthenicsUSACO 2010 December Gold | |
| #22500 | Big Macs Around the WorldUSACO 2010 December Gold | |