| 100 | The 3n + 1 problem | ★ | | |
| 105 | The Skyline Problem | ★★ | | |
| 108 | Maximum Sum | ★★★ | | |
| 111 | History Grading | ★★★ | | |
| 118 | Mutant Flatworld Explorers | ★ | | |
| 122 | Trees on the level | ★★★ | | |
| 141 | The Spot Game | ★ | | |
| 145 | Gondwanaland Telecom | ★★ | | |
| 147 | Dollars | ★ | | |
| 151 | Power Crisis | ★★★ | | |
| 160 | Factors and Factorials | ★★★ | | |
| 165 | Stamps | ★★★★ | | |
| 166 | Making Change | ★★★★ | | |
| 240 | Variable Radix Huffman Encoding | ★★★★ | | |
| 242 | Stamps and Envelope Size | ★★★ | | |
| 245 | Uncompress | ★★★ | | |
| 255 | Correct Move | ★★ | | |
| 256 | Quirksome Squares | ★ | | |
| 263 | Number Chains | ★ | | |
| 264 | Count on Cantor | ★ | | |
| 272 | TeX Quotes | ★ | | |
| 288 | Arithmetic Operations With Large Integers | ★★★★ | | |
| 294 | Divisors | ★★ | | |
| 297 | Quadtrees | ★★★ | | |
| 299 | Train Swapping | ★ | | |
| 300 | Maya Calendar | ★★★ | | |
| 302 | John's trip | ★★★★ | | |
| 315 | Network | ★★★★ | | |
| 337 | Interpreting Control Sequence | ★★ | | |
| 340 | Master-Mind Hints | ★★★ | | |
| 357 | Let Me Count The Ways | ★★★ | | |
| 374 | Big Mod | ★ | | |
| 378 | Intersecting Lines | ★★★ | | |
| 380 | Call Forwarding | ★★★ | | |
| 382 | Perfection | ★ | | |
| 389 | Basically Speaking | ★★ | | |
| 392 | Polynomial Showdown | ★ | | |
| 397 | Equation Elation | ★★★ | | |
| 401 | Palindromes | ★★ | | |
| 406 | Prime Cuts | ★★ | | |
| 409 | Exeuses, Excuses! | ★★ | | |
| 417 | Word Index | ★★ | | |
| 437 | The Tower of Babylon | ★★★★ | | |
| 439 | Knight Moves | ★★★ | | |
| 441 | Lotto | ★★ | | |
| 442 | Matrix Chain Multiplication | ★★ | | |
| 455 | Periodic Strings | ★ | | |
| 458 | The Decoder | ★ | | |
| 482 | Permutation Arrays | ★ | | |
| 483 | Word Scramble | ★ | | |
| 488 | Triangle Wave | ★ | | |
| 490 | Rotating Sentences | ★ | | |
| 494 | Kindergarten Counting Game | ★ | | |
| 496 | Simply Subsets | ★★ | | |
| 499 | What's The Frequency, Kenneth? | ★ | | |
| 501 | Black Box | ★★★ | | |
| 512 | Spreadsheet Tracking | ★★★ | | |
| 514 | Rails | ★★★ | | |
| 516 | Prime Land | ★★ | | |
| 532 | Dungeon Master | ★★★ | | |
| 534 | Frogger | ★★★ | | |
| 536 | Tree Recovery | ★★★ | | |
| 540 | Team Queue | ★★ | | |
| 541 | Error Correction | ★ | | |
| 543 | Goldbach’s Conjecture | ★★ | | |
| 544 | Heavy Cargo | ★★★ | | |
| 572 | Oil Deposits | ★ | | |
| 573 | The Snail | ★ | | |
| 579 | ClockHands | ★ | | |
| 580 | Critical Mass | ★★★ | | |
| 591 | Box of Bricks | ★ | | |
| 612 | DNA Sorting | ★★ | | |
| 615 | Is It A Tree? | ★★★ | | |
| 630 | Anagrams (II) | ★★ | | |
| 657 | The Die is Cast | ★★★ | | |
| 665 | False coin | ★★ | | |
| 673 | Parentheses Balance | ★★ | | |
| 674 | Coin Change | ★★★ | | |
| 679 | Dropping Balls | ★★★ | | |
| 686 | Goldbach’s Conjecture (II) | ★★ | | |
| 696 | How Many Knights | ★★ | | |
| 706 | LC-Display | ★★ | | |
| 709 | Formatting Text | ★★★★ | | |
| 714 | Copying Books | ★★★★ | | |
| 719 | Glass Beads | ★★★ | | |
| 725 | Division | ★★ | | |
| 748 | Exponentiation | ★★★ | | |
| 753 | A Plug for UNIX | ★★★★ | | |
| 793 | Network Connections | ★★ | | |
| 798 | Title Puzzle | ★★★ | | |
| 815 | Flooded! | ★★★ | | |
| 820 | Internet Bandwidth | ★★★★ | | |
| 828 | Deciphering Messages | ★★★ | | |
| 834 | Continued Fractions | ★★ | | |
| 846 | Steps | ★★ | | |
| 855 | Lunch in Grid City | ★★ | | |
| 865 | Substitution Cypher | ★★ | | |
| 900 | Brick Wall Patterns | ★★★★ | | |
| 907 | Winterim Backpacking Trip | ★★★ | | |
| 913 | Joana and the Odd Numbers | ★ | | |
| 928 | Eternal Truths | ★★★★ | | |
| 929 | Number Maze | ★★★ | | |
| 941 | Permutations | ★★★ | | |
| 948 | Fibonaccimal Base | ★ | | |
| 967 | Circular | ★★ | | |
| 991 | Safe Salutations | ★★★ | | |
| 993 | Product of Digits | ★★ | | |
| 997 | Show the Sequence | ★★★★ | | |
| 1056 | Degrees of Separation | ★★★ | | |
| 1062 | Containers | ★★★ | | |
| 1101 | addmul | ★★★★ | | |
| 1118 | Binary Stirling Numbers | ★★ | | |
| 1193 | Radar Installation | ★★★ | | |
| 1200 | A DP Problem | ★★ | | |
| 1203 | Argus | ★★ | | |
| 1207 | AGTC | ★★★ | | |
| 1208 | Oreon | ★★★ | | |
| 1210 | Sum of Consecutive Prime Numbers | ★★★ | | |
| 1225 | Digit Counting | ★ | | |
| 1234 | RACING | ★★★★ | | |
| 1237 | Expert Enough? | ★★ | | |
| 1242 | Necklace | ★★★★ | | |
| 1260 | Sales | ★ | | |
| 1262 | Password | ★★★ | | |
| 1292 | Strategic game | ★★★★ | | |
| 1316 | Supermarket | ★★★ | | |
| 1339 | Ancient Cipher | ★★ | | |
| 1366 | Martian Mining | ★★★ | | |
| 1368 | DNA Consensus String | ★★ | | |
| 1371 | Period | ★★★★ | | |
| 1513 | Movie collection | ★★★★ | | |
| 1556 | Disk Tree | ★★★★ | | |
| 1583 | Digit Generator | ★ | | |
| 1585 | Score | ★ | | |
| 1587 | Box | ★ | | |
| 1594 | Ducci Sequence | ★ | | |
| 1632 | Alibaba | ★★★ | | |
| 1640 | The Counting Problem | ★★ | | |
| 1644 | Prime Gap | ★★ | | |
| 1650 | Number String | ★★★★ | | |
| 1657 | Game | ★★★★ | | |
| 1660 | Cable TV Network | ★★★★ | | |
| 1714 | Keyboarding | ★★★★ | | |
| 1730 | Sum of MSLCM | ★★ | | |
| 1746 | String Theory | ★★★ | | |
| 10000 | Longest Paths | ★★★★ | | |
| 10002 | Center of Masses | ★★★ | | |
| 10003 | Cutting Sticks | ★ | | |
| 10004 | Bicoloring | ★★★ | | |
| 10005 | Packing polygons | ★★★ | | |
| 10007 | Count the Trees | ★★★★ | | |
| 10008 | What's Cryptanalysis? | ★ | | |
| 10010 | Where's Waldorf? | ★ | | |
| 10012 | How Big Is It? | ★★★ | | |
| 10015 | Joseph's Cousin | ★★★ | | |
| 10018 | Reverse and Add | ★★ | | |
| 10019 | Funny Encryption Method | ★ | | |
| 10020 | Minimal coverage | ★★ | | |
| 10023 | Square root | ★★★ | | |
| 10024 | Curling up the cube | ★★★★ | | |
| 10025 | The ? 1 ? 2 ? ... ? n = k problem | ★★★ | | |
| 10026 | Shoemaker's Problem | ★★★ | | |
| 10032 | Tug of War | ★★★★ | | |
| 10035 | Primary Arithmetic | ★ | | |
| 10036 | Divisibility | ★★★ | | |
| 10038 | Jolly Jumpers | ★ | | |
| 10041 | Vito's family | ★ | | |
| 10042 | Smith Numbers | ★★ | | |
| 10050 | Hartals | ★ | | |
| 10055 | Hashmat the Brave Warrior | ★ | | |
| 10056 | What is the Probability? | ★ | | |
| 10057 | A Mid-summer Night's Dream | ★ | | |
| 10062 | Tell me the frequencies! | ★ | | |
| 10066 | The Twin Towers | ★★★ | | |
| 10071 | Back to High School Physics | ★ | | |
| 10074 | Take the Land | ★★★ | | |
| 10079 | Pizza Cutting | ★ | | |
| 10080 | Gopher II | ★★★ | | |
| 10081 | Tight words | ★★★ | | |
| 10082 | WERTYU | ★ | | |
| 10093 | An Easy Problem! | ★ | | |
| 10099 | The Tourist Guide | ★★★ | | |
| 10101 | Bangla Numbers | ★ | | |
| 10104 | Euclid Problem | ★ | | |
| 10106 | Product | ★★★ | | |
| 10107 | What is the Median? | ★ | | |
| 10110 | Light, more light | ★★ | | |
| 10125 | Sumsets | ★★ | | |
| 10126 | Zipf's Law | ★★★★ | | |
| 10130 | SuperSale | ★★★ | | |
| 10131 | Is Bigger Smarter? | ★ | | |
| 10137 | The Trip | ★ | | |
| 10142 | Australian Voting | ★★ | | |
| 10150 | Doublets | ★★★ | | |
| 10161 | Ant on a Chessboard | ★★ | | |
| 10162 | Last Digit | ★★★ | | |
| 10169 | Urn-ball Probabilities! | ★★★★ | | |
| 10170 | The Hotel with Infinite Rooms | ★ | | |
| 10179 | Irreducible Basic Fractions | ★ | | |
| 10182 | Bee Maja | ★★★ | | |
| 10188 | Automated Judge Script | ★ | | |
| 10189 | Minesweeper | ★ | | |
| 10190 | Divide, But Not Quite Conquer! | ★ | | |
| 10191 | Longest Nap | ★★★ | | |
| 10193 | All You Need Is Love! | ★ | | |
| 10200 | Prime Time | ★★ | | |
| 10203 | Snow Clearing | ★★★★ | | |
| 10209 | Is This Integration ? | ★★ | | |
| 10220 | I Love Big Numbers ! | ★★ | | |
| 10221 | Satellites | ★ | | |
| 10222 | Decode the Mad man | ★ | | |
| 10226 | Hardwood Species | ★ | | |
| 10229 | Modular Fibonacci | ★★★★ | | |
| 10235 | Simply Emirp | ★ | | |
| 10242 | Fourth Point!! | ★ | | |
| 10249 | The Grand Dinner | ★★★ | | |
| 10252 | Common Permutation | ★ | | |
| 10254 | The Priest Mathematician | ★★★ | | |
| 10258 | Contest Scoreboard | ★★★★ | | |
| 10267 | Graphical Editor | ★★ | | |
| 10268 | 498-bis | ★ | | |
| 10273 | Eat or Not to Eat? | ★★ | | |
| 10279 | Mine Sweeper | ★★★ | | |
| 10295 | Hay Points | ★★ | | |
| 10298 | Power Strings | ★★ | | |
| 10308 | Roads in the North | ★★★ | | |
| 10309 | Turn the Lights Off | ★★★★ | | |
| 10326 | The Polynomial Equation | ★★★ | | |
| 10327 | Flip Sort | ★ | | |
| 10336 | Rank the Languages | ★★ | | |
| 10340 | All in All | ★ | | |
| 10355 | Superman | ★★★ | | |
| 10364 | Square | ★★★★ | | |
| 10365 | Blocks | ★★ | | |
| 10369 | Arctic Network | ★★★ | | |
| 10382 | Watering Grass | ★★ | | |
| 10397 | Connect the Campus | ★★★ | | |
| 10404 | Bachet's Game | ★★★★ | | |
| 10405 | Longest Common Subsequence | ★★★ | | |
| 10407 | Simple division | ★★★ | | |
| 10409 | Die Game | ★ | | |
| 10415 | Eb Alto Saxophone Player | ★ | | |
| 10420 | List of Conquests | ★ | | |
| 10443 | Rock, Scissors, Paper | ★ | | |
| 10465 | Homer Simpson | ★★★★ | | |
| 10474 | Where is the marble | ★ | | |
| 10487 | Closest Sums | ★ | | |
| 10530 | Guessing Game | ★★ | | |
| 10533 | Digit Primes | ★★★ | | |
| 10534 | Wavio Sequence | ★★ | | |
| 10539 | Almost Prime Numbers | ★★ | | |
| 10550 | Combination Lock | ★ | | |
| 10583 | Ubiquitous Religions | ★★★★ | | |
| 10591 | Happy Number | ★ | | |
| 10603 | Fill | ★★★★ | | |
| 10606 | Opening Doors | ★★★★ | | |
| 10626 | Buying Coke | ★★★ | | |
| 10633 | Rare Easy Problem | ★ | | |
| 10635 | Prince and Princess | ★★★★ | | |
| 10642 | Can You Solve It | ★ | | |
| 10664 | Luggage | ★★★ | | |
| 10666 | The Eurocup is Here! | ★★ | | |
| 10672 | Marbles on a tree | ★★★ | | |
| 10684 | The jackpot | ★ | | |
| 10690 | Expression Again | ★★★ | | |
| 10700 | Camel trading | ★★★ | | |
| 10718 | Bit Mask | ★★★ | | |
| 10721 | Bar Codes | ★★★★ | | |
| 10740 | First Love!!! | ★★★ | | |
| 10763 | Foreign Exchange | ★★ | | |
| 10783 | Odd Sum | ★ | | |
| 10789 | Prime Frequency | ★ | | |
| 10800 | Not That Kind of Graph | ★★★ | | |
| 10810 | Ultra-QuickSort | ★★★ | | |
| 10812 | Beat the Spread! | ★ | | |
| 10813 | Traditional BINGO | ★★ | | |
| 10815 | Andy’s First Dictionary | ★★ | | |
| 10858 | Unique Factorization | ★★ | | |
| 10903 | Rock-Paper-Scissors Tournament | ★★ | | |
| 10905 | Children's Game | ★★ | | |
| 10908 | Largest Squares | ★ | | |
| 10912 | Simple Minded Hashing | ★★★ | | |
| 10921 | Find the Telephone | ★ | | |
| 10922 | 2 the 9s | ★ | | |
| 10929 | You Can Say 11 | ★ | | |
| 10931 | Parity | ★ | | |
| 11000 | Bee | ★ | | |
| 11003 | Boxes | ★★★★ | | |
| 11005 | Cheapest Base | ★ | | |
| 11008 | Antimatter Ray Clearcutting | ★★★★ | | |
| 11039 | Building designing | ★★★ | | |
| 11040 | Add bricks in the wall | ★★ | | |
| 11054 | Wine trading in Gergovig | ★ | | |
| 11057 | Exact Sum | ★ | | |
| 11059 | Maximum Product | ★★ | | |
| 11063 | B2-sequence | ★ | | |
| 11067 | Little Red Riding Hood | ★★★ | | |
| 11078 | Open Credit System | ★★ | | |
| 11082 | Matrix Decompressing | ★★★★ | | |
| 11085 | Back to the 8-Queens | ★★★★ | | |
| 11094 | Continents | ★★★ | | |
| 11121 | Base -2 | ★★★ | | |
| 11150 | Cola | ★ | | |
| 11157 | Dynamic Frog | ★★ | | |
| 11175 | From D to E and Back | ★★★★ | | |
| 11192 | Group Reverse | ★ | | |
| 11219 | How old are you? | ★ | | |
| 11220 | Decoding the message. | ★ | | |
| 11233 | Deli Deli | ★★ | | |
| 11240 | Antimonotonicity | ★★ | | |
| 11258 | String Partition | ★★★ | | |
| 11264 | Coin Collector | ★★★ | | |
| 11284 | Shopping Trip | ★★★★ | | |
| 11286 | Conformity | ★★ | | |
| 11309 | COUNTING CHAOS | ★★★ | | |
| 11321 | Sort! Sort!! And Sort!!! | ★ | | |
| 11332 | Summing Digits | ★ | | |
| 11336 | DRM | ★★★ | | |
| 11344 | The Huge One | ★★ | | |
| 11349 | Symmetric Matrix | ★ | | |
| 11360 | Having Fun with Matrices | ★★ | | |
| 11364 | Parking | ★ | | |
| 11389 | The Bus Driver Problem | ★★ | | |
| 11401 | Triangle Counting | ★★★★ | | |
| 11413 | Fill the Containers | ★★★ | | |
| 11417 | GCD | ★ | | |
| 11455 | Behold My Quadrangle | ★ | | |
| 11456 | Trainsorting | ★★★★ | | |
| 11461 | Square Numbers | ★ | | |
| 11472 | Beautiful Numbers | ★★★★ | | |
| 11475 | Extend to Palindromes | ★ | | |
| 11481 | Arrange the Numbers | ★★★★ | | |
| 11489 | Integer Game | ★★ | | |
| 11495 | Bubbles and Buckets | ★★★ | | |
| 11498 | Division of Nlogonia | ★ | | |
| 11518 | Dominos 2 | ★★★ | | |
| 11526 | H(n) | ★★★ | | |
| 11536 | Smallest Sub-Array | ★★ | | |
| 11538 | Chess Queen | ★★ | | |
| 11541 | Decoding | ★ | | |
| 11576 | Scrolling Sign | ★ | | |
| 11584 | Partitioning by Palindromes | ★★★ | | |
| 11624 | Fire! | ★★★★ | | |
| 11633 | Food portion size | ★★★★ | | |
| 11634 | Generate random numbers | ★ | | |
| 11636 | Hello World! | ★ | | |
| 11639 | Guard the Land | ★ | | |
| 11659 | Informants | ★★★★ | | |
| 11677 | Alarm Clock | ★ | | |
| 11678 | Cards' Exchange | ★ | | |
| 11689 | Soda Surpler | ★ | | |
| 11728 | Alternate Task | ★ | | |
| 11730 | Number Transformation | ★★★ | | |
| 11743 | Credit Check | ★ | | |
| 11747 | Heavy Cycle Edges | ★★★ | | |
| 11764 | Jumping Mario | ★ | | |
| 11792 | Krochanska is Here! | ★★★ | | |
| 11806 | Cheerleaders | ★★★ | | |
| 11824 | A Minimum Land Price | ★ | | |
| 11908 | Skyscraper | ★★★ | | |
| 11917 | Do Your Own Homework! | ★★ | | |
| 11934 | Magic Formula | ★ | | |
| 11942 | Lumberjack Sequencing | ★ | | |
| 11956 | Brainfuck | ★★ | | |
| 11957 | Checkers | ★★ | | |
| 11960 | Divisor Game | ★★★ | | |
| 11987 | Almost Union-Find | ★★★★ | | |
| 11995 | I Can Guess the Data Structure! | ★★★ | | |
| 12015 | Google is Feeling Lucky | ★ | | |
| 12019 | Doom's Day Algorithm | ★ | | |
| 12041 | BFS (Binary Fibonacci String) | ★★★★ | | |
| 12063 | Zeros and Ones | ★★★★ | | |
| 12096 | The SetStack Computer | ★★★★ | | |
| 12195 | Jingle Composing | ★ | | |
| 12208 | How Many Ones Needed? | ★★★ | | |
| 12218 | An Industrial Spy | ★★★ | | |
| 12223 | Moving to Nuremberg | ★★★★ | | |
| 12250 | Language Detection | ★ | | |
| 12319 | Edgetown’s Traffic Jams | ★★★ | | |
| 12335 | Lexicographic Order | ★★★★ | | |
| 12382 | Grid of Lamps | ★★★ | | |
| 12385 | Interesting Sequences | ★★★ | | |
| 12428 | Enemy at the Gates | ★★★ | | |
| 12442 | Forwarding Emails | ★★★ | | |
| 12455 | Bars | ★★ | | |
| 12503 | Robot Instructions | ★★ | | |
| 12532 | Interval Product | ★★★★ | | |
| 12546 | LCM Pair Sum | ★★ | | |
| 12581 | Divisibility | ★★★★ | | |
| 12592 | Slogan Learning of Princess | ★★ | | |
| 12602 | Nice Licence Plates | ★ | | |
| 12627 | Erratic Expansion | ★★★ | | |
| 12650 | Dangerous Dive | ★ | | |
| 12654 | Patches | ★★★ | | |
| 12694 | Meeting Room Arrangement | ★★★ | | |
| 12797 | Letters | ★★★ | | |
| 12820 | Cool Word | ★★ | | |
| 12869 | Zeroes | ★★ | | |
| 12882 | City Park | ★★★ | | |
| 12908 | The book thief | ★ | | |
| 12911 | Subset sum | ★★★★ | | |
| 12918 | Lucky Thief | ★★ | | |
| 12959 | Strategy Game | ★ | | |
| 12970 | Alcoholic Pilots | ★★ | | |
| 13043 | Marbles | ★★★★ | | |
| 13055 | Inception | ★★ | | |
| 13157 | Prime Distance | ★★★★ | | |
| 13171 | Pixel Art | ★★ | | |
| 13185 | DPA Numbers I | ★★★ | | |
| 13190 | Rockabye Tobby | ★★ | | |
| 13204 | Count these Permutations | ★★★★ | | |
| 13211 | Geonosis | ★★★★ | | |
| 13242 | Pool Filling | ★★ | | |
| 13257 | License Plates | ★★★ | | |
| — | Prefix expression evaluation | ★ | | |
| — | Sudoku (As Good As Lee Hsien Loong) | ★ | | |
| — | Set partition | ★ | | |
| — | Sorting the alphanumeric list in comma separated value format | ★ | | |
| — | Parser and evaluator | ★ | | |
| — | Minimum Path Sum | ★ | | |
| — | Longest Increasing Subsequence | ★ | | |
| — | Unique lines | ★ | | |
| — | Longest monotonically increasing subsequence | ★ | | |
| — | Solving Maze Problems | ★ | | |
| — | Climbing Stairs | ★ | | |
| — | Line Overlap Problem | ★ | | |
| — | The N-th Element | ★ | | |
| — | Binary tree traversals | ★ | | |
| — | Recursion and Mod | ★ | | |
| — | Missing Numbers | ★ | | |