The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 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 glesnick 594 83 51ms 23 Nov 2022 882nd MeWhenI 🇻🇦 593 82 297ms 15 Feb 2023 883rd blaztoma 🇱🇹 592 105 2ms 4 Sep 2025 884th Bmrl7 591 98 2ms 12 Feb 2024 885th bac0id 591 134 428ms 27 Sep 2023 886th CarsonChr 🇺🇸 588 84 13ms 7 Apr 2024 887th twocatsinatrenchcoat 587 84 16ms 29 Nov 2022 887th FortuiteMan 🇫🇷 587 84 17ms 21 Jul 2025 889th msbranicky 587 113 2,645ms 9 Jan 2025 889th snoozingnewt 🇨🇦 587 113 2,691ms 13 Oct 2025 891st blaztoma 🇱🇹 587 135 410ms 2 Sep 2025 892nd fuzzylojik-golf 🇺🇸 586 80 389ms 6 Jul 2025 893rd msbranicky 586 162 286ms 21 Aug 2023 894th dokutan 585 75 1,090ms 29 Aug 2025 895th blaztoma 🇱🇹 584 64 8ms 17 Aug 2025 896th yoshykai 583 136 386ms 15 Apr 2025 897th snoozingnewt 🇨🇦 582 125 481ms 13 Oct 2025 898th madeforlosers 581 85 351ms 21 Oct 2024 899th blaztoma 🇱🇹 580 95 159ms 4 Sep 2025 900th Yewzir 🇧🇪 579 112 121ms 28 Mar 2024 901st blaztoma 🇱🇹 579 114 39ms 2 Sep 2025 902nd weeble 578 75 27ms 24 Dec 2024 903rd Natanaelel 🇸🇪 578 149 172ms 27 Jul 2025 904th aksyristos 574 63 637ms 9 Feb 2023 905th emgordon154 574 68 166ms 9 Aug 2024 906th AZ9tumas 574 86 15ms 17 Dec 2022 906th Mikey-Beep 🇬🇧 574 86 15ms 2 Jun 2024 906th khaninm 574 86 22ms 4 Jun 2025 906th keelimeguy 🇺🇸 574 86 12ms 14 Jun 2025 906th acollett89 574 86 10ms 4 Aug 2025 911th blaztoma 🇱🇹 570 72 292ms 17 Aug 2025 912th KatieLG 🇬🇧 568 87 88ms 26 Dec 2022 912th ShiraJoseph 🇺🇸 568 87 16ms 18 Feb 2023 912th Protothor 568 87 15ms 1 Jun 2025 915th Yewzir 🇧🇪 566 135 70ms 9 Feb 2024 916th nwellnhof 🇩🇪 565 43 37ms 21 Nov 2022 917th scpchicken 🇵🇼 564 37 2ms 15 days ago 918th blaztoma 🇱🇹 564 68 1,240ms 3 Sep 2025 919th TaserTheFox 🇺🇸 562 73 2,391ms 7 Jun 2023 920th dokutan 561 88 16ms 28 Sep 2024 921st msbranicky 560 155 25ms 3 Jan 2024 922nd MarcMush 🇫🇷 559 87 387ms 3 Jan 2024 923rd tomh1012 555 89 14ms 8 days ago 924th tomh1012 553 136 502ms 14 Nov 2025 925th msbranicky 552 89 94ms 15 Aug 2023 926th klixel 🇨🇦 552 156 150ms 25 Feb 2025 927th dokutan 550 71 137ms 28 Sep 2024 928th two-bad 🇬🇧 549 90 356ms 24 Feb 2024 929th fantaize 549 157 134ms 17 days ago 930th SirFireball3521 548 90 16ms 23 Jan 2023 930th yuchuehw 548 90 15ms 10 Feb 2024 930th robin-scragg 548 90 13ms 25 Oct 2025 933rd msbranicky 547 145 402ms 9 Jan 2024 934th msbranicky 546 101 144ms 1 Jan 2024 935th MeWhenI 🇻🇦 546 136 43ms 4 Sep 2024 936th dokutan 545 114 39ms 1 Aug 2024 937th LeeCamp 542 91 31ms 8 Jan 2023 937th tomh1012 542 91 15ms 26 Feb 2026 939th Yewzir 🇧🇪 541 139 378ms 11 Feb 2024 940th gigaprofisi 🇺🇸 537 92 115ms 1 Nov 2025 941st snoozingnewt 🇨🇦 537 140 381ms 13 Oct 2025 942nd WillowWispy 536 92 12ms 17 Mar 2025 942nd osNiko 🇧🇷 536 92 16ms 18 Aug 2025 944th snoozingnewt 🇨🇦 536 116 10ms 13 Oct 2025 945th adamnielson42 🇺🇸 533 47 312ms 29 Aug 2023 946th inverseLorentz 🇦🇺 531 93 19ms 7 Jan 2024 947th blaztoma 🇱🇹 529 92 199ms 3 Sep 2025 948th MeWhenI 🇻🇦 529 109 5ms 22 May 2023 949th QuincyNash 🇺🇸 525 94 24ms 27 Nov 2022 950th Shanethegamer 🇺🇸 525 99 39ms 16 Dec 2022 951st HumanoidCPU 524 126 170ms 26 Jun 2024 952nd dokutan 523 93 279ms 18 Mar 2025 953rd dokutan 522 48 6ms 6 Mar 2025 954th TheCod-r 🇦🇶 520 95 17ms 26 Feb 2023 954th Ultra814 520 95 13ms 22 Aug 2025 956th AlephSquirrel 520 100 14ms 10 Oct 2024 957th snoozingnewt 🇨🇦 520 106 154ms 13 Oct 2025 958th matejmatik123 🇸🇰 520 147 1,408ms 2 Oct 2025 959th madex 🇩🇪 516 70 39ms 13 Jun 2023 959th rvs314 516 70 86ms 24 Sep 2024 First Prev 881–960 of 1,669 Next Last