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?
Inventory 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 881st bac0id 591 134 428ms 27 Sep 2023 882nd CarsonChr 🇺🇸 588 84 13ms 7 Apr 2024 883rd twocatsinatrenchcoat 587 84 16ms 29 Nov 2022 883rd FortuiteMan 🇫🇷 587 84 17ms 21 Jul 2025 885th msbranicky 587 113 2,645ms 9 Jan 2025 885th snoozingnewt 🇨🇦 587 113 2,691ms 13 Oct 2025 887th blaztoma 🇱🇹 587 135 410ms 2 Sep 2025 888th fuzzylojik-golf 🇺🇸 586 80 389ms 6 Jul 2025 889th msbranicky 586 162 286ms 21 Aug 2023 890th dokutan 585 75 1,090ms 29 Aug 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 blaztoma 🇱🇹 580 95 159ms 4 Sep 2025 896th Yewzir 🇧🇪 579 112 121ms 28 Mar 2024 897th blaztoma 🇱🇹 579 114 39ms 2 Sep 2025 898th weeble 578 75 27ms 24 Dec 2024 899th Natanaelel 🇸🇪 578 149 158ms 27 Jul 2025 900th aksyristos 574 63 637ms 9 Feb 2023 901st emgordon154 574 68 166ms 9 Aug 2024 902nd AZ9tumas 574 86 15ms 17 Dec 2022 902nd Mikey-Beep 🇬🇧 574 86 15ms 2 Jun 2024 902nd khaninm 574 86 22ms 4 Jun 2025 902nd keelimeguy 🇺🇸 574 86 12ms 14 Jun 2025 902nd acollett89 574 86 10ms 4 Aug 2025 907th blaztoma 🇱🇹 570 72 292ms 17 Aug 2025 908th KatieLG 🇬🇧 568 87 88ms 26 Dec 2022 908th ShiraJoseph 🇺🇸 568 87 16ms 18 Feb 2023 908th Protothor 568 87 15ms 1 Jun 2025 911th Yewzir 🇧🇪 566 135 70ms 9 Feb 2024 912th nwellnhof 🇩🇪 565 43 37ms 21 Nov 2022 913th scpchicken 🇵🇼 564 37 2ms 14 days ago 914th blaztoma 🇱🇹 564 68 1,240ms 3 Sep 2025 915th TaserTheFox 🇺🇸 562 73 2,391ms 7 Jun 2023 916th dokutan 561 88 16ms 28 Sep 2024 917th msbranicky 560 155 25ms 3 Jan 2024 918th MarcMush 🇫🇷 559 87 387ms 3 Jan 2024 919th tomh1012 555 89 14ms 7 days ago 920th tomh1012 553 136 502ms 14 Nov 2025 921st msbranicky 552 89 94ms 15 Aug 2023 922nd klixel 🇨🇦 552 156 147ms 25 Feb 2025 923rd dokutan 550 71 137ms 28 Sep 2024 924th two-bad 🇬🇧 549 90 356ms 24 Feb 2024 925th fantaize 549 157 123ms 16 days ago 926th SirFireball3521 548 90 16ms 23 Jan 2023 926th yuchuehw 548 90 15ms 10 Feb 2024 926th robin-scragg 548 90 13ms 25 Oct 2025 929th msbranicky 547 145 402ms 9 Jan 2024 930th msbranicky 546 101 144ms 1 Jan 2024 931st MeWhenI 🇻🇦 546 136 43ms 4 Sep 2024 932nd dokutan 545 114 39ms 1 Aug 2024 933rd LeeCamp 542 91 31ms 8 Jan 2023 933rd aksyristos 542 91 1,082ms 17 Jan 2023 933rd tomh1012 542 91 15ms 26 Feb 2026 936th Yewzir 🇧🇪 541 139 378ms 11 Feb 2024 937th gigaprofisi 🇺🇸 537 92 115ms 1 Nov 2025 938th snoozingnewt 🇨🇦 537 140 381ms 13 Oct 2025 939th WillowWispy 536 92 12ms 17 Mar 2025 939th osNiko 🇧🇷 536 92 16ms 18 Aug 2025 941st snoozingnewt 🇨🇦 536 116 10ms 13 Oct 2025 942nd adamnielson42 🇺🇸 533 47 312ms 29 Aug 2023 943rd inverseLorentz 🇦🇺 531 93 19ms 7 Jan 2024 944th blaztoma 🇱🇹 529 92 199ms 3 Sep 2025 945th MeWhenI 🇻🇦 529 109 5ms 22 May 2023 946th QuincyNash 🇺🇸 525 94 24ms 27 Nov 2022 947th Shanethegamer 🇺🇸 525 99 39ms 16 Dec 2022 948th HumanoidCPU 524 126 170ms 26 Jun 2024 949th dokutan 523 93 279ms 18 Mar 2025 950th dokutan 522 48 6ms 6 Mar 2025 951st TheCod-r 🇦🇶 520 95 17ms 26 Feb 2023 951st Ultra814 520 95 13ms 22 Aug 2025 953rd AlephSquirrel 520 100 14ms 10 Oct 2024 954th snoozingnewt 🇨🇦 520 106 154ms 13 Oct 2025 955th matejmatik123 🇸🇰 520 147 1,408ms 2 Oct 2025 956th madex 🇩🇪 516 70 39ms 13 Jun 2023 956th rvs314 516 70 86ms 24 Sep 2024 958th mousetail 🇳🇱 516 84 22ms 16 Sep 2024 959th adamreidsmith 514 96 17ms 16 Feb 2024 960th Shanethegamer 🇺🇸 511 91 87ms 7 Dec 2024 First Prev 881–960 of 1,666 Next Last