| #2201 | Key StorageNorthern Eurasia Finals 2019NERC 2019 | |
| #2202 | LexicographyNorthern Eurasia Finals 2019NERC 2019 | |
| #2203 | AutomorphismPetrozavodsk Winter 2018 Day 8Yuhao Du Contest | |
| #2204 | BorderPetrozavodsk Winter 2018 Day 8Yuhao Du Contest | |
| #2205 | ConvolutionPetrozavodsk Winter 2018 Day 8Yuhao Du Contest | |
| #2206 | DecompositionPetrozavodsk Winter 2018 Day 8Yuhao Du Contest | |
| #2207 | EditPetrozavodsk Winter 2018 Day 8Yuhao Du Contest | |
| #2208 | FlowPetrozavodsk Winter 2018 Day 8Yuhao Du Contest | |
| #2209 | Good GamePetrozavodsk Winter 2018 Day 8Yuhao Du Contest | |
| #2210 | Hamilton PathPetrozavodsk Winter 2018 Day 8Yuhao Du Contest | |
| #2211 | IOI Problem RevisedPetrozavodsk Winter 2018 Day 8Yuhao Du Contest | |
| #2212 | Jump Jump JumpPetrozavodsk Winter 2018 Day 8Yuhao Du Contest | |
| #2213 | KnightPetrozavodsk Winter 2018 Day 8Yuhao Du Contest | |
| #2214 | Link Cut DigraphPetrozavodsk Winter 2018 Day 8Yuhao Du Contest | |
| #2221 | Silver Star Stands AloneCTU Open Contest 2021 | |
| #2222 | TomTom CruiseCTU Open Contest 2021 | |
| #2223 | Mad DiamondCTU Open Contest 2021Petrozavodsk Winter 2022 Day 4 | |
| #2224 | Burizon FortCTU Open Contest 2021 | |
| #2225 | Terrace HillCTU Open Contest 2021 | |
| #2226 | Eidam-Sand LairCTU Open Contest 2021 | |
| #2227 | Organ-free ManCTU Open Contest 2021 | |
| #2228 | Bread PitCTU Open Contest 2021 | |
| #2229 | Cyanide RiversCTU Open Contest 2021 | |
| #2230 | Screamers in the StormCTU Open Contest 2021 | |
| #2231 | Tone BanksCTU Open Contest 2021 | |
| #2232 | Win DieselCTU Open Contest 2021 | |
| #2263 | Three-Axis ViewsYokohama Regional 2020Moscow International Workshops 2021 Day 3 | |
| #2264 | Secrets of Legendary TreasureYokohama Regional 2020Moscow International Workshops 2021 Day 3 | |
| #2265 | Short CodingYokohama Regional 2020Moscow International Workshops 2021 Day 3 | |
| #2266 | Colorful RectangleYokohama Regional 2020Moscow International Workshops 2021 Day 3 | |
| #2267 | Jewelry SizeYokohama Regional 2020Moscow International Workshops 2021 Day 3 | |
| #2268 | Solar CarYokohama Regional 2020Moscow International Workshops 2021 Day 3 | |
| #2269 | To be Connected, or not to be, that is the QuestionYokohama Regional 2020Moscow International Workshops 2021 Day 3 | |
| #2270 | LCM of GCDsYokohama Regional 2020Moscow International Workshops 2021 Day 3 | |
| #2271 | High-Tech DetectiveYokohama Regional 2020Moscow International Workshops 2021 Day 3 | |
| #2272 | Formica SokobanicaYokohama Regional 2020Moscow International Workshops 2021 Day 3 | |
| #2273 | Suffixes may Contain PrefixesYokohama Regional 2020Moscow International Workshops 2021 Day 3 | |
| #2274 | DiversityCEOI 2021 | |
| #2275 | L-triominoesCEOI 2021 | |
| #2276 | NewspapersCEOI 2021 | |
| #2277 | StonesCEOI 2021InteractiveUnavailable | |
| #2278 | TortoiseCEOI 2021 | |
| #2279 | WellsCEOI 2021 | |
| #2280 | Arm CoordinationBAPC 2021UKIEPC 2021 | |
| #2281 | BnPCBAPC 2021Petrozavodsk Winter 2022 Day 4UKIEPC 2021 | |
| #2282 | CangarooBAPC 2021Petrozavodsk Winter 2022 Day 4UKIEPC 2021 | |
| #2283 | Decelerating JumpBAPC 2021UKIEPC 2021 | |
| #2284 | Evolutionary ExcerptBAPC 2021InteractiveUKIEPC 2021 | |
| #2285 | Fair PlayBAPC 2021UKIEPC 2021 | |
| #2286 | Gyrating GlyphsBAPC 2021Petrozavodsk Winter 2022 Day 4InteractiveUKIEPC 2021 | |
| #2287 | Hamiltooonian HikeBAPC 2021UKIEPC 2021 | |
| #2288 | Implementation IrregularitiesBAPC 2021UKIEPC 2021 | |
| #2289 | Jail or JoyrideBAPC 2021Petrozavodsk Winter 2022 Day 4UKIEPC 2021 | |
| #2290 | Kinking CablesBAPC 2021Petrozavodsk Winter 2022 Day 4UKIEPC 2021 | |
| #2291 | Lopsided LineupBAPC 2021Petrozavodsk Winter 2022 Day 4UKIEPC 2021 | |
| #2292 | Access DeniedNWERC 2021Interactive | |
| #2293 | Boredom BusterNWERC 2021Interactive | |
| #2294 | Cutting EdgeNWERC 2021 | |
| #2295 | Dyson CircleNWERC 2021 | |
| #2296 | Exchange StudentsNWERC 2021 | |
| #2297 | Flatland OlympicsNWERC 2021 | |
| #2298 | Glossary ArrangementNWERC 2021 | |
| #2299 | Heating UpNWERC 2021 | |
| #2300 | IXth ProblemNWERC 2021 | |