The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 days. Why not try and solve them ahead of time?
Day of Week 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 MeWhenI 🇻🇦 745 112 4ms 26 May 2023 882nd rucin93 🇵🇱 743 82 382ms 16 Jan 2024 883rd xnacly 🇩🇪 741 91 57ms 4 Jul 2023 883rd vphoebe 741 91 61ms 23 Aug 2024 883rd denkyuu1 741 91 90ms 23 Feb 2026 886th Yewzir 🇧🇪 739 59 7ms 12 May 2023 886th fischfood 739 59 6ms 9 Aug 2024 886th randomuser1312 🇨🇭 739 59 6ms 30 Oct 2025 889th Shanethegamer 🇺🇸 739 363 1,449ms 10 Apr 2025 890th horvaro 736 80 368ms 19 Apr 2023 891st dokutan 736 145 291ms 28 Apr 2025 892nd MeWhenI 🇻🇦 736 167 610ms 15 May 2023 893rd inventshah 735 83 389ms 20 Jan 2024 893rd edsrzf 🇳🇿 735 83 425ms 23 Sep 2024 893rd commandz0 🇺🇸 735 83 464ms 1 Sep 2025 896th kkoenig 733 55 2ms 23 Jan 2024 897th wes-sleeman 729 93 1,313ms 31 May 2023 897th dokutan 729 93 1,302ms 14 Oct 2024 899th XioR112 🇵🇱 728 90 24ms 29 Aug 2023 900th Msleizak 🇫🇷 727 22 270ms 2 Oct 2023 900th kkoenig 727 22 425ms 28 Dec 2023 900th janbehrens 🇩🇪 727 22 266ms 3 Jan 2024 900th inventshah 727 22 379ms 10 Feb 2024 900th edsrzf 🇳🇿 727 22 372ms 9 Oct 2024 900th Babafaba 727 22 431ms 4 Nov 2025 900th plcc0 727 22 384ms 4 days ago 907th emgordon154 727 82 131ms 6 Sep 2024 908th annaproxy 726 84 420ms 21 Jan 2024 909th jwhear 🇺🇸 726 254 198ms 27 Apr 2023 910th niklv 🇷🇺 725 93 10ms 22 Apr 2023 910th lewdev 🇺🇸 725 93 11ms 3 Jul 2024 910th Roachbones 725 93 17ms 17 Jan 2026 913th Yewzir 🇧🇪 722 122 44ms 28 Oct 2023 913th edsrzf 🇳🇿 722 122 44ms 6 Jan 2026 915th scpchicken 🇵🇼 720 91 37ms 16 Apr 2023 915th stefangimmillaro 720 91 20ms 20 Apr 2023 915th Alex-x90 🇺🇸 720 91 21ms 15 May 2023 915th AlexanderFair 720 91 22ms 11 Jul 2023 915th fkantelberg 720 91 19ms 14 Jul 2023 915th orthoplex 🇨🇽 720 91 22ms 3 Oct 2023 915th Ralac07 🇦🇺 720 91 22ms 11 Jun 2024 915th EnTerr 720 91 22ms 8 Sep 2024 915th Pyroan 720 91 20ms 16 Apr 2025 915th bknower 720 91 21ms 27 Jun 2025 915th dgambit 720 91 23ms 20 Jan 2026 926th sisyphus-ppcg 🇦🇺 718 66 113ms 17 Apr 2023 926th primo-ppcg 🇹🇭 718 66 104ms 22 Apr 2023 926th Natanaelel 🇸🇪 718 66 113ms 8 Jun 2025 926th edsrzf 🇳🇿 718 66 110ms 9 Jan 2026 930th emplv 🇱🇻 718 83 220ms 28 Mar 2025 931st BREMAUCY 🇫🇷 717 85 400ms 6 Dec 2025 932nd dteague3989 717 94 11ms 27 May 2023 932nd Ralac07 🇦🇺 717 94 52ms 4 Jul 2024 934th kops-cg 716 84 18ms 18 Mar 2025 935th hacker112 🇸🇪 715 61 5ms 22 Jun 2024 936th MeWhenI 🇻🇦 714 124 59ms 17 Apr 2023 937th Shanethegamer 🇺🇸 712 53 38ms 16 Apr 2023 937th SirBogman 🇺🇸 712 53 42ms 16 Oct 2023 937th annaproxy 712 53 38ms 16 Oct 2023 937th olleicua 🇺🇸 712 53 44ms 24 Dec 2023 937th Yewzir 🇧🇪 712 53 40ms 26 Dec 2023 937th FlorianCassayre 🇫🇷 712 53 41ms 20 May 2024 937th jipsong 🇩🇪 712 53 45ms 26 Jul 2024 937th xyangst 712 53 37ms 3 Oct 2024 937th tatzyr 🇯🇵 712 53 42ms 9 Nov 2024 937th edsrzf 🇳🇿 712 53 38ms 23 Nov 2024 937th BREMAUCY 🇫🇷 712 53 41ms 30 Dec 2024 937th Andriamanitra 🇫🇮 712 53 39ms 12 Jan 2025 937th CaedenHarper 🇨🇦 712 53 41ms 31 Aug 2025 937th fuzzylojik-golf 🇺🇸 712 53 38ms 13 Sep 2025 951st damoc1es 712 92 14ms 16 Apr 2023 951st celiendonze 🇨🇭 712 92 15ms 17 Apr 2023 951st CarsonChr 🇺🇸 712 92 15ms 20 Apr 2023 951st kyleclaassen 712 92 14ms 24 May 2023 951st b10011 🇫🇮 712 92 14ms 12 Jun 2023 951st rollershutter 712 92 14ms 20 Jun 2023 951st RomanHauksson 712 92 15ms 20 Jul 2023 951st cros107 🇦🇺 712 92 14ms 18 Aug 2023 951st Mikey-Beep 🇬🇧 712 92 13ms 25 Aug 2023 951st m42km 712 92 23ms 13 Nov 2023 First Prev 881–960 of 1,506 Next Last