The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?
Farey Sequence 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 881st scpchicken 🇵🇼 497 90 3ms 13 Dec 2023 882nd janbehrens 🇩🇪 497 97 657ms 9 Jan 2024 883rd mathisfun271 496 113 20ms 23 Dec 2023 883rd Artemis21 🇬🇧 496 113 12ms 22 Jan 2026 885th msbranicky 496 142 1,025ms 6 Jan 2024 886th dokutan 495 104 1,273ms 29 Oct 2024 887th Yewzir 🇧🇪 494 112 7ms 5 Feb 2024 888th TeodorDyakov 🇧🇬 493 131 2ms 5 Jan 2026 889th snoozingnewt 🇨🇦 492 116 1,753ms 15 Oct 2025 890th tomh1012 492 149 453ms 26 hours ago 891st dokutan 488 111 2ms 28 Apr 2025 892nd HumanEquivalentUnit 488 133 14ms 5 Dec 2023 893rd anarconic 487 115 12ms 11 Dec 2023 893rd moustave 487 115 22ms 19 Nov 2024 893rd damoose717 487 115 21ms 23 May 2025 896th snoozingnewt 🇨🇦 484 112 1ms 15 Oct 2025 897th NanduBC 483 116 12ms 6 Sep 2024 898th msbranicky 483 130 2ms 2 Jan 2024 898th prestosilver 🇺🇸 483 130 130ms 3 Feb 2026 900th Yewzir 🇧🇪 482 100 202ms 26 Feb 2024 901st msbranicky 482 134 2ms 2 Jan 2024 902nd madeforlosers 479 113 2ms 8 Dec 2023 903rd dokutan 478 140 40ms 29 Oct 2024 904th snoozingnewt 🇨🇦 475 167 3ms 15 Oct 2025 905th MaxCastella 🇫🇷 473 89 830ms 1 Dec 2023 906th dokutan 473 149 1,026ms 30 Nov 2025 907th KatieLG 🇬🇧 472 109 1,268ms 2 Jan 2024 908th dokutan 472 161 127ms 1 Feb 2026 909th trinityy-7 470 123 25ms 6 Dec 2023 910th RockOfStone 470 140 4ms 23 Mar 2024 911th msbranicky 469 118 5ms 2 Jan 2024 911th dokutan 469 118 5ms 10 Apr 2025 913th Feniske 🇫🇷 468 90 293ms 1 Dec 2023 914th dokutan 467 135 1,297ms 31 Mar 2025 915th dokutan 466 126 158ms 26 Oct 2024 916th HumanoidCPU 466 132 93ms 5 Jun 2024 917th msbranicky 465 144 39ms 2 Jan 2024 918th AsbestosSniffer 464 184 1,445ms 1 Dec 2023 919th cmkb3 463 91 295ms 1 Dec 2023 920th msbranicky 463 111 1,271ms 2 Jan 2024 921st msbranicky 463 117 2ms 6 Jan 2024 922nd TinyTheBrontosaurus 463 121 20ms 3 Dec 2023 922nd RobertHoeh 463 121 12ms 9 Dec 2023 922nd klixel 🇨🇦 463 121 12ms 21 Jun 2025 925th CatsAreFluffy 462 140 4ms 31 Jan 2024 926th snoozingnewt 🇨🇦 462 145 38ms 15 Oct 2025 927th msbranicky 461 159 404ms 2 Jan 2024 928th lelbal 459 122 11ms 24 days ago 929th Stockoh 🇫🇷 456 123 12ms 23 Apr 2024 930th Liibe 456 166 385ms 2 Oct 2025 931st pedro-a-soares 455 127 13ms 6 Dec 2023 932nd snoozingnewt 🇨🇦 454 92 33ms 15 Oct 2025 933rd snoozingnewt 🇨🇦 454 158 26ms 15 Oct 2025 934th MeWhenI 🇻🇦 452 89 113ms 1 Dec 2023 935th yuchuehw 452 124 20ms 15 May 2024 936th HumanoidCPU 451 139 122ms 5 Jun 2024 937th aydamak 449 93 37ms 15 May 2024 938th estomagordo 🇳🇱 448 125 12ms 25 Mar 2025 939th Vaekor 445 126 12ms 28 Feb 2024 940th msbranicky 445 153 122ms 2 Jan 2024 941st Kaffeleif 444 156 14ms 13 Mar 2024 942nd denkyuu1 441 127 20ms 7 Feb 2026 943rd HumanoidCPU 441 165 2,684ms 24 Oct 2024 944th snoozingnewt 🇨🇦 439 115 7ms 15 Oct 2025 945th 4ndyJ 🇬🇧 438 128 12ms 29 Feb 2024 946th BambooleanLogic 🇸🇪 438 132 29ms 1 Dec 2023 947th CutSandstone 435 129 11ms 19 Jul 2024 947th wh3n3v3r 🇨🇿 435 129 24ms 18 Nov 2024 947th Andrey2001 435 129 19ms 1 Feb 2026 947th tomh1012 435 129 14ms 19 Feb 2026 951st sidok 434 111 485ms 26 Apr 2024 952nd janbehrens 🇩🇪 433 175 424ms 16 Dec 2023 953rd dokutan 432 146 39ms 29 Oct 2024 954th addmai 431 130 20ms 30 Jul 2025 954th Googolplexo 🇷🇺 431 130 19ms 42 hours ago 956th acollett89 431 134 31ms 5 Aug 2025 957th snoozingnewt 🇨🇦 429 129 5ms 15 Oct 2025 958th bjornmartensson 428 131 80ms 11 Dec 2023 958th Mabeloid 🇳🇴 428 131 20ms 11 Sep 2024 960th epic-programmer-guy 428 170 130ms 3 Jan 2024 First Prev 881–960 of 1,534 Next Last