The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 hours. Why not try and solve them ahead of time?
Van Eck 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 Shanethegamer 🇺🇸 594 117 145ms 12 Sep 2024 882nd HumanoidCPU 594 159 288ms 23 Dec 2025 883rd CaedenHarper 🇨🇦 593 129 515ms 5 Oct 2025 884th aksyristos 592 75 97ms 28 Dec 2022 885th emgordon154 591 86 28ms 28 Dec 2024 886th MichalMarsalek 🇨🇿 589 87 17ms 3 Dec 2021 886th willschremmer 589 87 21ms 4 Apr 2024 888th JGDoerrer 587 134 455ms 3 Jan 2022 889th c0d3-4-F00d 🇩🇪 586 70 23ms 27 May 2021 890th Jonatan6 🇩🇰 586 100 2ms 27 Apr 2024 890th Herbert00709 🇵🇱 586 100 2ms 1 Nov 2024 892nd Andrey135296 585 124 367ms 3 Jan 2022 892nd snoozingnewt 🇨🇦 585 124 367ms 13 Oct 2025 894th KenanSi 583 35 3ms 22 Feb 2022 895th befoster 583 88 24ms 8 May 2021 895th mrmena 🇦🇺 583 88 57ms 6 Jul 2021 895th martinnorling 🇸🇪 583 88 17ms 10 Feb 2022 895th abba23 583 88 15ms 27 May 2022 895th bbakersmith 583 88 15ms 28 Jun 2022 895th santiagvalencia 583 88 23ms 6 Mar 2025 901st Ripick 583 90 127ms 19 Aug 2025 902nd Yewzir 🇧🇪 582 91 135ms 27 Mar 2024 903rd bac0id 582 135 63ms 23 Feb 2024 904th pandapawskat 580 101 3ms 26 Aug 2021 904th User2654 580 101 2ms 12 Mar 2023 906th Shanethegamer 🇺🇸 580 145 25ms 13 Jul 2021 907th Re-Adventures 🇮🇳 579 135 152ms 5 Jan 2023 908th msbranicky 579 163 306ms 16 Sep 2023 909th targrik 577 71 10ms 29 Jul 2025 910th bastienvoirin 🇫🇷 576 89 16ms 14 Sep 2021 910th Troon 576 89 58ms 18 Oct 2022 910th PaulMWeiser 576 89 16ms 5 Mar 2023 910th aalec 576 89 21ms 25 Apr 2024 910th ComputerKWasTaken 🇺🇸 576 89 12ms 23 Jan 2025 910th ImpressedByRocks 576 89 53ms 13 Feb 2025 910th smilesformiles3 576 89 60ms 24 Sep 2025 917th j-Ewan 576 164 290ms 23 Mar 2022 917th 0xjac 🇨🇭 576 164 312ms 9 Jun 2025 919th TheZwierzLF 🇵🇱 575 64 36ms 17 Dec 2025 920th c0d3-4-F00d 🇩🇪 575 102 2ms 5 Dec 2021 921st prplz 🇦🇺 575 133 393ms 11 May 2021 922nd MeWhenI 🇻🇦 574 54 3ms 16 Apr 2023 923rd emgordon154 574 88 20ms 8 Dec 2024 924th snoozingnewt 🇨🇦 574 99 2ms 13 Oct 2025 925th MarcMush 🇫🇷 573 74 834ms 11 Jul 2021 925th snoozingnewt 🇨🇦 573 74 391ms 14 Oct 2025 927th Mabeloid 🇳🇴 573 84 490ms 6 Oct 2024 928th cbrt-x 573 94 120ms 20 Jan 2025 929th akshatj27 🇦🇶 572 165 313ms 11 Jan 2022 930th janbehrens 🇩🇪 571 134 387ms 21 Nov 2022 931st wiebecommajonas 571 137 123ms 20 Nov 2021 932nd jhonw 570 42 34ms 23 Sep 2023 933rd AkashTandon167 570 90 14ms 1 Nov 2021 933rd jfallon1997 570 90 15ms 9 Aug 2022 933rd myleopard 570 90 18ms 22 Dec 2022 933rd thienudomsrirungruang 570 90 15ms 14 Nov 2024 937th SpareManiKatti 569 72 11ms 10 Sep 2021 937th CatsAreFluffy 569 72 10ms 16 Dec 2022 939th warmCabin 569 103 2ms 7 Nov 2023 940th MeWhenI 🇻🇦 568 100 2ms 15 Sep 2022 941st yoshykai 567 135 469ms 31 Mar 2025 942nd Shanethegamer 🇺🇸 566 75 363ms 2 Sep 2021 943rd snoozingnewt 🇨🇦 564 149 26ms 13 Oct 2025 944th MaxElf999 563 91 21ms 27 Sep 2022 944th Yewzir 🇧🇪 563 91 30ms 19 May 2023 944th aaardwark 563 91 15ms 2 Jun 2025 944th YAJUE114514 563 91 17ms 3 Jul 2025 944th osNiko 🇧🇷 563 91 18ms 22 Aug 2025 949th snoozingnewt 🇨🇦 563 98 90ms 13 Oct 2025 950th weliveinhell 🇭🇹 563 104 2ms 3 Oct 2023 951st btjones0 562 64 10ms 20 May 2021 952nd MeWhenI 🇻🇦 562 79 90ms 12 Dec 2022 953rd Shotokhan 562 140 2,908ms 2 Oct 2025 954th Shanethegamer 🇺🇸 561 82 1,025ms 8 Sep 2021 955th cure-honey 🇯🇵 558 110 101ms 11 Jul 2021 956th Jacob385 558 137 484ms 28 Oct 2025 957th MathieuIko 557 92 40ms 21 Feb 2022 957th SniperSmiley 🇺🇸 557 92 18ms 21 Jun 2022 957th Vaekor 557 92 14ms 28 Jul 2023 957th eiburns 557 92 14ms 27 Oct 2023 First Prev 881–960 of 1,856 Next Last