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 881st IISResetMe 595 69 273ms 30 Jun 2023 882nd blaztoma 🇱🇹 592 105 2ms 4 Sep 2025 883rd CarsonChr 🇺🇸 588 84 13ms 7 Apr 2024 884th bac0id 587 135 428ms 27 Sep 2023 884th blaztoma 🇱🇹 587 135 410ms 2 Sep 2025 886th Just4FunCoder 586 89 39ms 23 Mar 2023 887th msbranicky 586 162 286ms 21 Aug 2023 888th dokutan 585 75 1,090ms 29 Aug 2025 889th msbranicky 585 113 2,645ms 9 Jan 2025 889th snoozingnewt 🇨🇦 585 113 2,691ms 13 Oct 2025 891st blaztoma 🇱🇹 584 64 8ms 17 Aug 2025 892nd yoshykai 583 136 386ms 15 Apr 2025 893rd snoozingnewt 🇨🇦 582 125 481ms 13 Oct 2025 894th madeforlosers 581 85 351ms 21 Oct 2024 895th SirFireball3521 580 90 16ms 23 Jan 2023 895th yuchuehw 580 90 15ms 10 Feb 2024 897th blaztoma 🇱🇹 580 95 159ms 4 Sep 2025 898th Yewzir 🇧🇪 579 112 121ms 28 Mar 2024 899th blaztoma 🇱🇹 579 114 39ms 2 Sep 2025 900th weeble 578 75 27ms 24 Dec 2024 901st Natanaelel 🇸🇪 578 149 158ms 27 Jul 2025 902nd aksyristos 574 63 637ms 9 Feb 2023 903rd acollett89 574 86 10ms 4 Aug 2025 904th LeeCamp 573 91 31ms 8 Jan 2023 904th aksyristos 573 91 1,082ms 17 Jan 2023 904th tomh1012 573 91 15ms 26 Feb 2026 907th blaztoma 🇱🇹 570 72 292ms 17 Aug 2025 908th MarcMush 🇫🇷 569 87 387ms 3 Jan 2024 909th KatieLG 🇬🇧 568 87 69ms 26 Dec 2022 909th ShiraJoseph 🇺🇸 568 87 16ms 18 Feb 2023 909th Protothor 568 87 15ms 1 Jun 2025 912th WillowWispy 567 92 12ms 17 Mar 2025 912th osNiko 🇧🇷 567 92 16ms 18 Aug 2025 914th Yewzir 🇧🇪 566 135 70ms 9 Feb 2024 915th nwellnhof 🇩🇪 565 43 37ms 21 Nov 2022 916th scpchicken 🇵🇼 564 37 2ms 14 days ago 917th blaztoma 🇱🇹 564 68 1,240ms 3 Sep 2025 918th TaserTheFox 🇺🇸 562 73 2,391ms 7 Jun 2023 919th inverseLorentz 🇦🇺 561 93 19ms 7 Jan 2024 920th msbranicky 560 155 25ms 3 Jan 2024 921st CatsAreFluffy 555 70 2,629ms 31 Jan 2023 922nd dokutan 555 89 14ms 27 Sep 2024 922nd tomh1012 555 89 14ms 7 days ago 924th QuincyNash 🇺🇸 555 94 24ms 27 Nov 2022 925th tomh1012 553 136 502ms 14 Nov 2025 926th msbranicky 552 89 94ms 15 Aug 2023 927th klixel 🇨🇦 552 156 147ms 25 Feb 2025 928th two-bad 🇬🇧 549 90 356ms 24 Feb 2024 929th fantaize 549 157 123ms 16 days ago 930th msbranicky 547 145 402ms 9 Jan 2024 931st msbranicky 546 101 144ms 1 Jan 2024 932nd adamreidsmith 544 96 17ms 16 Feb 2024 933rd adamnielson42 🇺🇸 540 48 312ms 29 Aug 2023 934th blaztoma 🇱🇹 538 92 199ms 3 Sep 2025 935th gigaprofisi 🇺🇸 537 92 115ms 1 Nov 2025 936th Yewzir 🇧🇪 537 140 378ms 11 Feb 2024 936th snoozingnewt 🇨🇦 537 140 381ms 13 Oct 2025 938th snoozingnewt 🇨🇦 536 116 10ms 13 Oct 2025 939th TobyBoyne 🇬🇧 532 98 14ms 28 Nov 2022 939th TheLazySquid 532 98 15ms 23 Jan 2023 941st dokutan 529 49 6ms 6 Mar 2025 942nd MeWhenI 🇻🇦 528 109 5ms 22 May 2023 943rd Andrey2001 527 99 230ms 28 Jan 2026 944th Shanethegamer 🇺🇸 525 99 39ms 16 Dec 2022 945th HumanoidCPU 524 126 170ms 26 Jun 2024 946th MeWhenI 🇻🇦 522 119 12ms 12 Dec 2023 947th dokutan 521 95 279ms 18 Mar 2025 948th TheCod-r 🇦🇶 520 95 17ms 26 Feb 2023 948th Ultra814 520 95 13ms 22 Aug 2025 950th AlephSquirrel 520 100 14ms 10 Oct 2024 951st snoozingnewt 🇨🇦 520 106 154ms 13 Oct 2025 952nd matejmatik123 🇸🇰 520 147 1,408ms 2 Oct 2025 953rd brimstonetrader 517 101 15ms 8 Jan 2024 954th madex 🇩🇪 516 70 39ms 13 Jun 2023 954th rvs314 516 70 86ms 24 Sep 2024 956th mousetail 🇳🇱 516 84 22ms 16 Sep 2024 957th jameswmccarty 512 102 18ms 23 Feb 2025 958th Shanethegamer 🇺🇸 511 91 87ms 7 Dec 2024 959th Andriamanitra 🇫🇮 509 71 39ms 26 Apr 2023 960th amollberg 🇸🇪 507 103 22ms 23 Apr 2023 First Prev 881–960 of 1,680 Next Last