The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 29 hours. Why not try and solve them ahead of time?
Tower of Hanoi 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 794th te-chnical 669 74 12ms 23 Dec 2025 794th jumpingtj 669 74 12ms 7 days ago 803rd msbranicky 663 93 2,598ms 4 Dec 2025 804th acotis 663 99 120ms 2 Jan 2026 805th CaedenHarper 🇨🇦 662 157 1,890ms 30 Nov 2025 806th GolfingSuccess 🇬🇷 661 49 3ms 4 Nov 2025 807th bitsandbeyond 🇳🇱 661 119 121ms 31 Oct 2025 808th LostSyntax21 🇬🇧 660 75 18ms 30 Nov 2025 808th firegene 🇮🇪 660 75 11ms 20 Feb 2026 810th MeWhenI 🇻🇦 660 95 83ms 23 Nov 2025 811th Shanethegamer 🇺🇸 659 102 116ms 2 Nov 2025 812th bitsandbeyond 🇳🇱 656 75 148ms 5 Nov 2025 813th madex 🇩🇪 654 74 774ms 15 days ago 814th Yewzir 🇧🇪 654 116 28ms 30 Nov 2025 815th albanian-laundromat 653 91 4ms 24 Nov 2025 816th AutumnWind75 652 119 438ms 10 Dec 2025 817th Ripick 651 76 11ms 14 Nov 2025 817th scpchicken 🇵🇼 651 76 12ms 5 Dec 2025 819th GolfingSuccess 🇬🇷 651 157 1,459ms 7 Dec 2025 820th emgordon154 650 92 7ms 26 days ago 821st madex 🇩🇪 647 129 269ms 15 days ago 822nd BREMAUCY 🇫🇷 646 74 474ms 1 Dec 2025 822nd JOrE20 646 74 441ms 7 Jan 2026 824th jameswmccarty 643 96 2,403ms 8 Feb 2026 825th scpchicken 🇵🇼 643 100 10ms 17 days ago 826th mousetail 🇳🇱 642 77 12ms 23 Nov 2025 827th GolfingSuccess 🇬🇷 639 72 1ms 30 Oct 2025 828th AlephSquirrel 639 105 9ms 30 Nov 2025 829th dokutan 638 163 1,613ms 5 Dec 2025 830th HumanoidCPU 637 111 457ms 29 Nov 2025 831st msbranicky 637 131 303ms 4 Dec 2025 832nd Herbert00709 🇵🇱 636 78 5ms 26 days ago 833rd BREMAUCY 🇫🇷 636 97 2,505ms 3 Dec 2025 834th HumanoidCPU 636 122 57ms 29 Nov 2025 835th a6166231 🇨🇳 634 70 11ms 12 Feb 2026 836th Bmrl7 634 78 11ms 20 Dec 2025 837th D-MOVE 🇵🇭 632 71 42ms 25 days ago 838th prestosilver 🇺🇸 632 97 2ms 3 Dec 2025 839th scpchicken 🇵🇼 632 132 267ms 17 days ago 840th madex 🇩🇪 631 102 10ms 15 days ago 841st aksyristos 631 123 60ms 3 Dec 2025 841st yeminghan2021 631 123 63ms 3 Feb 2026 843rd stackofbears 630 62 34ms 22 Dec 2025 844th dokutan 630 95 7ms 25 Feb 2026 845th scpchicken 🇵🇼 629 76 478ms 1 Jan 2026 846th jameswmccarty 628 77 716ms 8 Feb 2026 847th msbranicky 626 79 11ms 26 Nov 2025 847th nemoyatpeace 626 79 16ms 28 Dec 2025 847th nstearns96 🇬🇧 626 79 11ms 31 Dec 2025 847th tomh1012 626 79 10ms 2 Mar 2026 847th Andrey2001 626 79 11ms 7 days ago 852nd HumanoidCPU 626 105 114ms 29 Nov 2025 853rd alexsave 625 71 10ms 30 Nov 2025 854th Waffle3z 622 87 2ms 26 Dec 2025 854th Andriamanitra 🇫🇮 622 87 2ms 2 Mar 2026 856th msbranicky 622 108 8ms 4 Dec 2025 857th tomh1012 621 77 435ms 2 Mar 2026 858th HumanoidCPU 621 85 91ms 29 Nov 2025 859th tomh1012 620 78 779ms 2 Mar 2026 860th IISResetMe 619 78 343ms 30 Nov 2025 861st MeWhenI 🇻🇦 618 76 5ms 23 Nov 2025 862nd HumanoidCPU 616 72 12ms 29 Nov 2025 862nd olleicua 🇺🇸 616 72 10ms 8 Dec 2025 864th JOrE20 614 102 43ms 28 Nov 2025 865th MeWhenI 🇻🇦 613 104 1,025ms 23 Nov 2025 866th HumanoidCPU 612 121 478ms 30 Nov 2025 867th AlephSquirrel 611 79 304ms 30 Nov 2025 868th kmathis22 611 101 2,374ms 10 days ago 869th madeforlosers 608 73 10ms 13 days ago 870th MeWhenI 🇻🇦 607 100 6ms 24 Nov 2025 871st TheZwierzLF 🇵🇱 606 74 36ms 5 Jan 2026 872nd tomh1012 606 103 427ms 12 Feb 2026 873rd msbranicky 605 79 457ms 3 Dec 2025 873rd madex 🇩🇪 605 79 447ms 15 days ago 873rd Andrey2001 605 79 461ms 7 days ago 876th albanian-laundromat 605 82 5ms 25 Nov 2025 877th MeWhenI 🇻🇦 605 111 123ms 24 Nov 2025 878th HumanoidCPU 604 99 7ms 1 Dec 2025 879th Schmitt-Very-Cool 604 127 8ms 6 Dec 2025 880th dokutan 603 104 77ms 23 Jan 2026 First Prev 801–880 of 1,465 Next Last