The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 25 hours. Why not try and solve them ahead of time?
Topological Sort in all languages in chars. Achievements Cheevos Holes Languages Medals Miscellaneous All Holes 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Calendar Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz Continued Fractions CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Multitap Input Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial All Languages ><> ALGOL 68 ArkScript Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig 05AB1E APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Bytes Chars Scoring Bytes Chars Language All ><> ALGOL 68 ArkScript Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig Experimental Language 05AB1E APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Hole All 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Calendar Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz Continued Fractions CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Multitap Input Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Experimental Hole Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Chars Time Submitted 321st BambooleanLogic 🇸🇪 374 221 12ms 12 days ago 322nd Artemis21 🇬🇧 372 187 81ms 6 Dec 2025 323rd robin-scragg 368 189 16ms 13 Nov 2025 324th emgordon154 362 152 41ms 18 Nov 2025 325th madex 🇩🇪 352 351 3ms 18 Jan 2026 326th OllieBoyne 🇬🇧 348 200 16ms 11 Dec 2025 327th madex 🇩🇪 345 202 18ms 18 Jan 2026 328th gigaprofisi 🇺🇸 345 240 12ms 6 Aug 2025 329th CaedenHarper 🇨🇦 344 203 2,523ms 27 Sep 2025 330th MeWhenI 🇻🇦 343 193 1,467ms 25 Nov 2025 331st guilhem-roy 🇫🇷 343 203 17ms 22 Nov 2025 332nd Bulmenisaurus 335 208 114ms 26 Oct 2025 333rd klixel 🇨🇦 333 209 18ms 15 Jan 2026 334th RobertBurs 328 212 17ms 24 Sep 2025 335th tomh1012 328 358 497ms 27 Feb 2026 336th CatsAreFluffy 318 219 21ms 30 Oct 2025 337th Jacob385 300 500 451ms 1 Sep 2025 338th KatieLG 🇬🇧 299 586 175ms 2 Aug 2025 339th FlorianCassayre 🇫🇷 294 237 15ms 5 Aug 2025 339th mbittner20 294 237 13ms 18 Aug 2025 341st CaedenHarper 🇨🇦 287 288 17ms 29 Aug 2025 342nd DialFrost 🇸🇬 281 248 15ms 10 Jul 2025 343rd Shotokhan 278 250 14ms 24 Sep 2025 344th H3XDaemon 277 251 15ms 19 Aug 2025 345th Babafaba 272 256 17ms 3 Nov 2025 346th muser-logiccpu 🇺🇦 264 264 19ms 16 Aug 2025 346th jameswmccarty 264 264 14ms 14 Feb 2026 348th CaedenHarper 🇨🇦 261 574 492ms 8 days ago 349th Babafaba 255 247 656ms 29 Oct 2025 350th didion0 🇺🇸 251 330 24ms 29 Aug 2025 351st tomh1012 249 279 25ms 27 Feb 2026 352nd DialFrost 🇸🇬 240 240 461ms 21 Dec 2025 353rd iczelia 🇩🇪 239 235 10ms 19 Oct 2025 354th CaedenHarper 🇨🇦 239 490 492ms 16 Oct 2025 355th ndren 239 2,498 1,785ms 27 Nov 2025 356th iczelia 🇩🇪 236 204 6ms 19 Oct 2025 357th msbranicky 225 309 16ms 12 Aug 2025 358th JOrE20 219 834 89ms 13 Feb 2026 359th jediroberthatch 211 330 19ms 1 Aug 2025 360th IISResetMe 203 332 1,466ms 9 Jan 2026 361st nstearns96 🇬🇧 203 343 17ms 8 Aug 2025 362nd acollett89 193 429 13ms 12 Aug 2025 363rd codewrite 🇬🇧 185 634 490ms 12 Jan 2026 364th dokutan 180 1,028 311ms 3 Aug 2025 365th iczelia 🇩🇪 177 575 16ms 19 Oct 2025 366th zakariamouhid 136 610 13ms 5 Sep 2025 367th Zhenyu-Bo 86 812 16ms 1 Aug 2025 368th AidanWalter 65 1,078 15ms 28 Nov 2025 369th 2bular 0 16 55ms 13 Jul 2025 369th saito-ta 🇯🇵 0 16 86ms 13 Jul 2025 371st aditsu 0 40 177ms 10 Aug 2025 372nd ovs-code 🇩🇪 0 55 4ms 14 Jul 2025 373rd ovs-code 🇩🇪 0 58 20ms 14 Jul 2025 374th aiwana 0 81 15ms 21 Oct 2025 375th Shanethegamer 🇺🇸 0 146 267ms 7 Aug 2025 376th dokutan 0 165 62ms 8 Feb 2026 377th edsrzf 🇳🇿 0 170 2,864ms 16 Aug 2025 First Prev 321–377 of 377