The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
Inventory Sequence in all languages in bytes. 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 Bytes Time Submitted 801st Shanethegamer 🇺🇸 660 75 292ms 22 Apr 2025 802nd CaedenHarper 🇨🇦 659 114 391ms 20 Oct 2025 803rd tatzyr 🇯🇵 657 55 39ms 12 Feb 2025 804th MeWhenI 🇻🇦 655 75 91ms 13 Dec 2022 805th RedzGoose 🇦🇺 655 99 120ms 11 Oct 2024 806th MeWhenI 🇻🇦 655 100 4ms 20 Jul 2023 807th CarsonChr 🇺🇸 654 115 403ms 7 Apr 2024 808th blaztoma 🇱🇹 652 76 494ms 2 Sep 2025 809th Vaekor 652 80 17ms 9 Jul 2023 809th rucin93 🇵🇱 652 80 22ms 10 Feb 2024 809th JunkIce 652 80 15ms 26 Dec 2024 809th fuzzylojik-golf 🇺🇸 652 80 16ms 9 Jun 2025 813th snoozingnewt 🇨🇦 652 101 89ms 13 Oct 2025 814th weliveinhell 🇭🇹 650 76 17ms 18 Sep 2023 814th itserasmus 650 76 19ms 9 Apr 2024 814th eranws 650 76 13ms 23 Dec 2024 817th edsrzf 🇳🇿 650 80 27ms 27 Aug 2025 818th blaztoma 🇱🇹 647 102 119ms 3 Sep 2025 819th snoozingnewt 🇨🇦 645 68 1,037ms 13 Oct 2025 820th fkantelberg 644 81 11ms 23 Jul 2023 820th CutSandstone 644 81 14ms 4 Jul 2024 822nd xyangst 642 77 14ms 7 Oct 2024 823rd msbranicky 641 103 125ms 19 Sep 2023 824th snoozingnewt 🇨🇦 640 97 2ms 13 Oct 2025 825th Lydxn 🇨🇦 639 124 405ms 24 Jun 2023 826th Shanethegamer 🇺🇸 638 77 94ms 12 Dec 2022 827th ericlangedijk 🇸🇮 637 118 457ms 23 May 2023 828th TaserTheFox 🇺🇸 636 82 17ms 31 Mar 2023 829th blaztoma 🇱🇹 636 132 114ms 27 Nov 2025 830th epic-programmer-guy 635 102 188ms 3 Jan 2024 831st edsrzf 🇳🇿 634 98 18ms 6 Jan 2025 832nd emgordon154 633 91 28ms 30 Dec 2024 833rd glesnick 629 83 51ms 23 Nov 2022 833rd Yewzir 🇧🇪 629 83 16ms 7 Feb 2024 833rd wh3n3v3r 🇨🇿 629 83 16ms 14 Nov 2024 836th snoozingnewt 🇨🇦 628 105 41ms 13 Oct 2025 837th madex 🇩🇪 626 94 2ms 14 Jun 2023 837th msbranicky 626 94 2ms 10 Jan 2024 839th emgordon154 625 68 166ms 9 Aug 2024 840th olleicua 🇺🇸 625 79 16ms 19 Jan 2024 841st janbehrens 🇩🇪 624 127 434ms 21 Nov 2022 842nd blaztoma 🇱🇹 623 151 24ms 3 Sep 2025 843rd twocatsinatrenchcoat 621 84 16ms 29 Nov 2022 843rd FortuiteMan 🇫🇷 621 84 17ms 21 Jul 2025 845th blaztoma 🇱🇹 620 107 1,025ms 2 Sep 2025 846th rucin93 🇵🇱 619 80 394ms 10 Feb 2024 846th JunkIce 619 80 406ms 26 Dec 2024 846th fuzzylojik-golf 🇺🇸 619 80 389ms 6 Jul 2025 849th Shanethegamer 🇺🇸 619 120 45ms 12 Sep 2024 850th blaztoma 🇱🇹 618 80 11ms 2 Sep 2025 851st snoozingnewt 🇨🇦 617 105 151ms 13 Oct 2025 852nd blaztoma 🇱🇹 616 118 149ms 2 Sep 2025 853rd MeWhenI 🇻🇦 615 101 2ms 24 Nov 2022 853rd msbranicky 615 101 19ms 4 Aug 2023 855th Yewzir 🇧🇪 612 81 469ms 7 Feb 2024 856th yzhs 🇩🇪 611 106 139ms 25 Jun 2023 857th emgordon154 610 71 25ms 19 Sep 2024 858th blaztoma 🇱🇹 609 72 1,009ms 3 Sep 2025 858th MeWhenI 🇻🇦 609 72 1,045ms 15 Sep 2025 860th emgordon154 609 205 4,420ms 18 Jul 2024 861st blaztoma 🇱🇹 608 138 1,296ms 2 Sep 2025 862nd blaztoma 🇱🇹 608 229 1,685ms 15 Sep 2025 863rd AZ9tumas 607 86 15ms 17 Dec 2022 863rd jmerle 🇳🇱 607 86 21ms 11 Jul 2023 863rd Mikey-Beep 🇬🇧 607 86 15ms 2 Jun 2024 863rd khaninm 607 86 22ms 4 Jun 2025 867th MeWhenI 🇻🇦 604 82 297ms 15 Feb 2023 868th retrohun 603 62 287ms 11 Mar 2023 869th Feniske 🇫🇷 603 68 308ms 6 Nov 2023 870th SwordF-Official 🇺🇸 603 103 11ms 17 Apr 2025 871st blaztoma 🇱🇹 602 60 35ms 2 Sep 2025 872nd alexsave 602 82 23ms 15 Nov 2025 873rd Bmrl7 600 98 2ms 12 Feb 2024 874th Ripick 600 110 394ms 24 Jun 2024 875th Emutis 🇱🇹 600 132 413ms 4 Sep 2025 876th Shanethegamer 🇺🇸 598 54 3ms 19 Nov 2022 876th snoozingnewt 🇨🇦 598 54 3ms 13 Oct 2025 878th Shanethegamer 🇺🇸 597 104 58ms 22 Dec 2023 878th Yewzir 🇧🇪 597 104 25ms 7 Feb 2024 880th emgordon154 596 35 3ms 18 days ago First Prev 801–880 of 1,680 Next Last