- 00100 — The 3n + 1 problem
- 00156 — Ananagrams
- 00195 — Anagram
- 00272 — TEX Quotes
- 00299 — Train Swapping
- 00353 — Pesky Palindromes
- 00401 — Palindromes
- 00454 — Anagrams
- 00482 — Permutation Arrays
- 00483 — Word Scramble
- 00514 — Rails
- 00573 — The Snail
- 00594 — One Little, Two Little, Three Little Endians
- 00612 — DNA Sorting
- 00640 — Self Numbers
- 00661 — Blowing Fuses
- 00673 — Parentheses Balance
- 00725 — Division
- 00727 — Equation
- 00787 — Maximum Sub-sequence Product
- 00821 — Page Hopping
- 00920 — Sunny Mountains
- 00993 — Product of Digits
- 01124 — Celebrity Jeopardy
- 01203 — Argus
- 01223 — Editor
- 01235 — Anti Brute Force Lock
- 01282 — Fibonacci Words
- 01649 — Binomial coefficients
- 01709 — Amalgamated Artichokes
- 01738 — Ceiling Function
- 10018 — Reverse and Add
- 10038 — Jolly Jumpers
- 10055 — Hashmat the Brave Warrior
- 10069 — Distinct Subsequences
- 10079 — Pizza Cutting
- 10107 — What is the Median?
- 10114 — Loansome Car Buyer
- 10131 — Is Bigger Smarter?
- 10137 — The Trip
- 10141 — Request for Proposal
- 10165 — Stone Game
- 10189 — Minesweeper
- 10194 — Football (aka Soccer)
- 10258 — Contest Scoreboard
- 10327 — Flip Sort
- 10334 — Ray Through Glasses
- 10363 — Tic Tac Toe
- 10433 — Automorphic Numbers
- 10469 — To Carry or not to Carry
- 10496 — Collecting Beepers
- 10534 — Wavio Sequence
- 10550 — Combination Lock
- 10670 — Work Reduction
- 10679 — I Love Strings!!
- 10684 — The Jackpot
- 10721 — Bar Codes
- 10810 — Ultra-QuickSort
- 10812 — Beat the Spread!
- 10911 — Forming Quiz Teams
- 10943 — How do you add?
- 10945 — Mother Bear
- 10954 — Add All
- 11044 — Searching for Nessy
- 11172 — Relational Operator
- 11221 — Magic square palindromes
- 11230 — Annoying Painting Tool
- 11309 — Counting Chaos
- 11336 — DRM
- 11340 — Newspaper
- 11350 — Stern-Brocot Tree
- 11462 — Age Sort
- 11495 — Bubbles and Buckets
- 11498 — Division of Nlogonia
- 11507 — Bender B
- 11511 — Frieze Patterns
- 11514 — Batman
- 11547 — Automatic Answer
- 11559 — Event Planning
- 11616 — Roman Numerals
- 11677 — Alarm Clock
- 11727 — Cost Cutting
- 11764 — Jumping Mario
- 11799 — Horror Dash
- 11849 — CD
- 11858 — Frosh Week
- 11966 — Galactic Bonding
- 11995 — I Can Guess the Data Structure!
- 12086 — Potentiometers
- 12239 — Bingo!
- 12243 — Flowers Flourish from France
- 12247 — Jollo
- 12319 — Edgetown's Traffic Jams
- 12322 — Handgun Shooting Sport
- 12324 — Philip J
- 12356 — Army Buddies
- 12462 — Rectangle
- 12516 — Cinema-cola
- 12637 — 30 Minutes or Less
- 12638 — Godels Dream
- 12639 — Hexagonal Puzzle
- 12640 — Largest Sum Game
- 12641 — Reodrnreig Lteetrs in Wrods
- 12642 — Shuffling Cards
- 12643 — Tennis Rounds
- 12644 — Vocabulary
- 12645 — Water Supply
- 12668 — Attacking Rooks
- 12670 — Counting ones
- 12671 — Disjoint Water Supply
- 12673 — Football
- 12783 — Weak Links
- 12784 — Dont Care
- 12785 — Emacs Plugin
- 12786 — Friendship Networks
- 12787 — Looking-Glass House
- 12788 — Smooth Factor
- 12854 — Automated Checking Machine
- 12855 — Black and white stones
- 12856 — Counting Substhreengs
- 12860 — Galaxy collision
- 12861 — Help Cupid
- 12862 — Intrepid climber
- 12918 — Lucky Thief
- 12940 — Next Palindromic Numbers
- 12942 — Sub-expression Counting
- 12943 — Designing an Electronic Device
- 12944 — Earthquake Disaster
- 12945 — Farmer Jane
- 12946 — Peanoland Contacting Gaussland
- 12947 — Texting with Grandma
- 12948 — Interstellar Travel
- 12949 — Voting Duels
- 13004 — At Most Twice
- 13005 — Blood Groups
- 13006 — Cake Cut
- 13007 — D as in Daedalus
- 13008 — Exposing Corruption
- 13009 — Fence the Vegetables Fail
- 13010 — Galactic Taxes
- 13011 — Height Map
- 13012 — Identifying Tea
- 13014 — Keep it Energized
- 13017 — Canvas Painting
- 13022 — Sheldon Numbers
- 13057 — Prove Them All
- 13058 — Baking Cakes with Grandma
- 13059 — Tennis Championship
- 13061 — Going Shopping with Grandma (I)
- 13062 — Going Shopping with Grandma (II)
- 13067 — Prime Kebab Menu
- 13068 — The Weakest Link
- 13107 — Royale With Cheese
- 13108 — Juanma and the Drinking Fountains
- 13109 — Elephants
- 13111 — The Price is Correct
- 13117 — ACIS, A Contagious vIruS
- 13118 — Binary Land
- 13119 — Castaways
- 13121 — Eclipsing Gianik Star
- 13122 — Funny Cardiologist
- 13123 — Christmas Lights
- 13124 — Socialhare
- 13125 — Water Troubles
- 13126 — Wildcards
- 13127 — Bank Robbery
- 13130 — Cacho
- 13184 — Counting Edges and Graphs
- 13185 — DPA Numbers I
- 13187 — Felipe and the Sequence
- 13189 — Humbertov and the Triangular Spiral
- 13190 — Rockabye Tobby
- 13191 — Tobby Primes
- 13193 — Rotations
- 13194 — DPA Numbers II