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?
Fractions 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 nulzo 709 85 16ms 17 Oct 2025 882nd janbehrens 🇩🇪 709 147 372ms 10 Jan 2022 882nd roavin 709 147 409ms 29 Jun 2022 884th janbehrens 🇩🇪 709 175 439ms 10 Jan 2022 885th lifthrasiir 🇰🇷 709 223 14ms 19 Dec 2024 886th MeWhenI 🇻🇦 707 167 1,261ms 7 Jun 2023 887th KrausRaus 🇺🇸 706 85 10ms 4 Sep 2021 887th uttumuttu 🇫🇮 706 85 10ms 4 Jan 2022 887th KatieLG 🇬🇧 706 85 13ms 7 Apr 2022 887th FlorianCassayre 🇫🇷 706 85 9ms 22 Sep 2022 887th trinityy-7 706 85 10ms 23 Jan 2024 887th RobertHoeh 706 85 10ms 1 Feb 2024 887th smclaughlin-cf 706 85 10ms 20 Mar 2025 887th jake6192 706 85 10ms 18 May 2025 887th kirjavascript 706 85 10ms 5 Aug 2025 896th ai-fischer 706 90 6ms 2 Oct 2021 897th NickTheEASDude 🇺🇸 706 104 1ms 17 Oct 2023 898th Andriamanitra 🇫🇮 705 117 4ms 17 Apr 2023 899th Yewzir 🇧🇪 705 123 237ms 16 May 2023 899th dokutan 705 123 241ms 29 Jun 2024 901st saito-ta 🇯🇵 705 188 2,043ms 8 Jun 2022 902nd MeWhenI 🇻🇦 705 247 1,634ms 7 Nov 2025 903rd snoozingnewt 🇨🇦 703 94 6ms 31 Oct 2025 904th emgordon154 703 117 8ms 21 days ago 905th tsschepens 700 124 2ms 14 days ago 906th MeWhenI 🇻🇦 699 60 4ms 16 Apr 2023 907th annaproxy 699 153 140ms 1 Aug 2022 907th cbrt-x 699 153 140ms 30 Aug 2024 909th Irratix 🇳🇱 699 155 446ms 3 Aug 2023 910th olivermrose 🇺🇸 698 86 11ms 20 Sep 2021 910th Garklein 🇨🇦 698 86 11ms 7 Jan 2022 910th GeorgeStechman 🇬🇧 698 86 11ms 11 Oct 2022 910th randolchance 698 86 10ms 12 Jan 2023 910th HumanoidCPU 698 86 14ms 30 Oct 2024 910th a6166231 🇨🇳 698 86 9ms 16 May 2025 910th Program-Pi 698 86 12ms 7 days ago 917th dieggsy 698 91 6ms 8 Oct 2024 918th Luckey-Elijah 698 124 108ms 17 Oct 2022 919th DialFrost 🇸🇬 698 174 2ms 14 Sep 2024 920th emgordon154 697 43 7ms 14 Jun 2025 921st ravnskjaer 🇩🇰 697 178 453ms 15 Dec 2025 922nd dokutan 696 105 39ms 26 Aug 2024 923rd bac0id 695 150 366ms 26 Sep 2023 923rd fuzzylojik-golf 🇺🇸 695 150 414ms 23 May 2025 925th Shanethegamer 🇺🇸 695 181 232ms 14 May 2023 926th Jonatan6 🇩🇰 694 125 2ms 19 May 2023 926th warmCabin 694 125 1ms 8 Nov 2023 926th 1231234md5 🇨🇳 694 125 1ms 20 Jan 2024 929th primo-ppcg 🇹🇭 693 87 16ms 8 Sep 2021 929th itsjustfreekie 693 87 11ms 17 Sep 2021 929th TheAtrossian 693 87 19ms 5 Jan 2025 929th HumanoidCPU 693 87 208ms 4 Mar 2025 933rd Shanethegamer 🇺🇸 691 112 79ms 31 Mar 2025 934th elgan65536 🇺🇸 691 182 218ms 15 Oct 2023 935th Mazn3k 690 87 10ms 13 Sep 2021 935th 5quiwyrm 690 87 10ms 19 Oct 2022 935th CarsonChr 🇺🇸 690 87 11ms 1 Apr 2024 935th markwithasee 690 87 10ms 27 Sep 2024 935th Palladium02 690 87 13ms 4 May 2025 935th daniel-cardone 690 87 10ms 25 Jun 2025 935th KasperKivimaeki 🇫🇮 690 87 11ms 18 Nov 2025 942nd m-tkach 🇺🇦 690 149 18ms 9 Mar 2023 943rd GolfingSuccess 🇬🇷 690 176 6ms 10 Sep 2022 944th underlein 690 180 414ms 10 Dec 2022 945th MeWhenI 🇻🇦 688 109 2ms 13 Oct 2023 946th DialFrost 🇸🇬 688 141 613ms 4 Jul 2024 947th GolfingSuccess 🇬🇷 686 93 50ms 13 Aug 2024 948th arctouch-cristiannevianna 686 152 453ms 23 Feb 2024 949th evnu 685 113 85ms 28 Jul 2023 949th jipsong 🇩🇪 685 113 87ms 1 Sep 2023 951st MeWhenI 🇻🇦 683 310 12ms 21 Apr 2025 952nd olleicua 🇺🇸 682 22 46ms 24 Mar 2024 953rd dokutan 682 79 132ms 15 Jun 2025 954th zakariamouhid 682 88 11ms 28 Feb 2023 954th TRexOnGit 682 88 10ms 28 Mar 2025 954th MrMullac 682 88 10ms 28 Mar 2025 957th snoozingnewt 🇨🇦 682 127 168ms 14 Dec 2025 958th billings7 🇬🇧 681 153 370ms 21 Nov 2021 959th yzhs 🇩🇪 681 157 148ms 25 Jun 2023 960th albanian-laundromat 681 311 325ms 16 Dec 2025 First Prev 881–960 of 1,997 Next Last