The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 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 481st Yax42 🇫🇷 805 91 438ms 31 Dec 2025 482nd GrayJoKing 🇦🇺 804 50 125ms 1 Dec 2023 483rd MeWhenI 🇻🇦 804 78 2ms 1 Dec 2023 483rd Yewzir 🇧🇪 804 78 3ms 26 May 2024 485th Shanethegamer 🇺🇸 804 89 41ms 12 Sep 2024 486th SirBogman 🇺🇸 803 234 16ms 4 Dec 2023 487th emgordon154 802 52 39ms 11 Sep 2024 487th sean-niemann 🇺🇸 802 52 37ms 13 Oct 2025 487th denkyuu1 802 52 37ms 4 Feb 2026 490th Steffan153 🇫🇮 802 63 108ms 5 Aug 2024 491st CaedenHarper 🇨🇦 802 72 12ms 23 Aug 2025 492nd MeWhenI 🇻🇦 802 99 3ms 1 Dec 2023 493rd 5cw 🇺🇸 801 70 33ms 6 Jun 2024 494th Kacarott 🇦🇺 798 79 64ms 13 Sep 2024 495th Yewzir 🇧🇪 798 81 2ms 26 May 2024 496th CaedenHarper 🇨🇦 798 95 493ms 3 Oct 2025 497th GolfingSuccess 🇬🇷 797 67 520ms 15 Jan 2024 497th MeWhenI 🇻🇦 797 67 494ms 17 Jan 2024 499th pardouin 🇫🇷 797 84 38ms 25 Apr 2025 500th edsrzf 🇳🇿 793 72 1,134ms 5 Sep 2025 501st tayloia 🇬🇧 791 73 11ms 3 Dec 2023 502nd albanian-laundromat 791 86 120ms 11 Nov 2025 503rd annaproxy 791 92 128ms 11 Dec 2023 504th MeWhenI 🇻🇦 791 179 1,695ms 7 Nov 2025 504th Yewzir 🇧🇪 791 179 1,901ms 14 Nov 2025 506th wuduculfre 790 71 11ms 22 Jul 2025 507th edsrzf 🇳🇿 788 80 65ms 28 Jul 2025 508th olleicua 🇺🇸 787 53 40ms 23 Dec 2023 509th emgordon154 787 88 11ms 10 Dec 2024 510th Shanethegamer 🇺🇸 785 68 410ms 18 Jan 2024 511th Shanethegamer 🇺🇸 785 69 1ms 1 Dec 2023 512th targrik 785 123 290ms 30 Jun 2025 513th DialFrost 🇸🇬 785 159 8ms 23 May 2025 514th snoozingnewt 🇨🇦 783 97 125ms 30 Nov 2025 515th tailorspy 783 109 60ms 12 Aug 2024 516th MeWhenI 🇻🇦 779 66 1,159ms 1 Dec 2023 516th ovs-code 🇩🇪 779 66 1,245ms 4 Dec 2023 516th emgordon154 779 66 1,225ms 9 Apr 2025 519th programjames 779 72 11ms 24 Dec 2023 519th keelimeguy 🇺🇸 779 72 11ms 14 Jun 2025 521st ovs-code 🇩🇪 779 89 11ms 12 Dec 2023 522nd albanian-laundromat 778 81 41ms 23 Feb 2026 523rd Natanaelel 🇸🇪 777 47 38ms 26 Jan 2024 524th pardouin 🇫🇷 776 92 10ms 25 Apr 2025 525th drabart 🇵🇱 776 110 63ms 2 Dec 2023 526th SirBogman 🇺🇸 774 69 462ms 15 Jan 2024 526th CaedenHarper 🇨🇦 774 69 527ms 30 Jul 2025 528th albanian-laundromat 774 146 1,436ms 13 Oct 2025 529th DialFrost 🇸🇬 773 54 38ms 1 Dec 2023 529th neel11235813 773 54 37ms 1 Dec 2023 529th error256 773 54 41ms 14 Feb 2025 529th anter69 🇭🇺 773 54 37ms 28 Feb 2026 533rd MeWhenI 🇻🇦 770 68 147ms 3 Aug 2024 534th Shanethegamer 🇺🇸 769 72 7ms 1 Dec 2023 535th MeWhenI 🇻🇦 768 80 87ms 1 Dec 2023 536th xsot 🇸🇬 768 93 10ms 5 Oct 2024 536th DialFrost 🇸🇬 768 93 10ms 6 Dec 2024 536th MeWhenI 🇻🇦 768 93 10ms 14 Feb 2025 539th Shanethegamer 🇺🇸 765 63 190ms 25 Sep 2024 540th MeWhenI 🇻🇦 765 66 6ms 1 Dec 2023 541st frankgraziano 765 95 8ms 21 Feb 2026 542nd MeWhenI 🇻🇦 763 71 1ms 1 Dec 2023 543rd CaedenHarper 🇨🇦 761 75 1,066ms 27 Sep 2025 544th pardouin 🇫🇷 761 91 10ms 26 Apr 2025 544th DialFrost 🇸🇬 761 91 12ms 1 Jan 2026 546th Yax42 🇫🇷 760 76 12ms 1 Jan 2026 546th Lv0Sys 🇵🇱 760 76 15ms 24 Feb 2026 548th KatieLG 🇬🇧 759 55 41ms 2 Jan 2024 548th TFeld00 🇩🇰 759 55 36ms 3 Sep 2024 548th aksyristos 759 55 36ms 11 days ago 551st Yewzir 🇧🇪 759 83 38ms 26 May 2024 552nd SirBogman 🇺🇸 758 53 133ms 4 Dec 2023 553rd JOrE20 758 74 11ms 22 Feb 2026 554th anter69 🇭🇺 757 68 1,248ms 28 Feb 2026 555th NickTheEASDude 🇺🇸 756 87 2ms 25 Apr 2024 556th MateuszPietrzak 🇵🇱 755 113 59ms 2 Dec 2023 557th stefangimmillaro 752 101 125ms 30 Apr 2024 558th albanian-laundromat 751 127 34ms 3 Dec 2025 559th weliveinhell 🇭🇹 750 77 11ms 2 Dec 2023 559th Maznek 750 77 11ms 9 Dec 2023 First Prev 481–560 of 1,535 Next Last