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?
Rijndael S-box 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 81st m-tkach 🇺🇦 878 385 2ms 23 Apr 2024 81st emgordon154 878 385 2ms 1 Nov 2024 83rd error256 877 140 1,378ms 1 May 2025 83rd bitsandbeyond 🇳🇱 877 140 1,397ms 23 Dec 2025 85th MeWhenI 🇻🇦 877 259 741ms 5 Oct 2023 86th edsrzf 🇳🇿 876 209 6ms 13 days ago 87th MeWhenI 🇻🇦 876 248 6ms 25 Mar 2024 88th jared-hughes 876 489 14ms 25 Dec 2023 89th primo-ppcg 🇹🇭 875 452 11ms 13 Aug 2025 90th emgordon154 874 119 415ms 11 Feb 2026 91st inventshah 874 122 37ms 25 Oct 2025 92nd Steffan153 🇫🇮 874 221 176ms 12 Jun 2024 93rd snoozingnewt 🇨🇦 874 260 116ms 20 Nov 2025 94th kg583 🇺🇸 872 98 27ms 20 Feb 2024 95th vlpx 🇫🇮 872 118 9ms 19 Jun 2024 96th MeWhenI 🇻🇦 871 381 100ms 27 Nov 2025 97th snoozingnewt 🇨🇦 870 258 117ms 25 days ago 98th kg583 🇺🇸 869 96 469ms 20 Feb 2024 98th lifthrasiir 🇰🇷 869 96 437ms 2 Dec 2024 98th sean-niemann 🇺🇸 869 96 466ms 5 Feb 2025 101st Steffan153 🇫🇮 867 87 37ms 29 Aug 2024 102nd KatieLG 🇬🇧 867 390 2ms 8 Oct 2025 103rd hallvabo 🇳🇴 863 99 19ms 12 Sep 2023 104th blaztoma 🇱🇹 860 261 129ms 29 Jan 2026 105th emgordon154 859 488 1,571ms 4 Oct 2025 106th MostParsingVex 853 439 96ms 3 days ago 107th sean-niemann 🇺🇸 851 121 10ms 7 Aug 2025 108th Steffan153 🇫🇮 851 157 38ms 21 Feb 2026 109th JayXon 🇺🇸 850 111 156ms 8 Oct 2025 110th bitsandbeyond 🇳🇱 849 158 402ms 23 Dec 2025 111th Steffan153 🇫🇮 847 146 2ms 18 Oct 2023 112th CornerMercury 🇬🇧 846 101 23ms 26 Feb 2026 113th edsrzf 🇳🇿 846 240 35ms 18 Feb 2026 114th edsrzf 🇳🇿 842 173 306ms 13 Jun 2025 115th error256 839 124 434ms 8 Oct 2025 116th Alex-x90 🇺🇸 839 127 40ms 2 Nov 2025 117th SirBogman 🇺🇸 838 90 35ms 21 Sep 2023 118th SirBogman 🇺🇸 838 102 16ms 21 Sep 2023 118th snoozingnewt 🇨🇦 838 102 27ms 20 Feb 2026 120th snoozingnewt 🇨🇦 837 158 88ms 27 Nov 2025 121st Steffan153 🇫🇮 836 200 128ms 18 Oct 2023 122nd error256 834 161 424ms 22 Nov 2024 123rd kg583 🇺🇸 833 138 19ms 25 Jan 2026 124th sean-niemann 🇺🇸 829 91 38ms 5 Aug 2025 125th CaedenHarper 🇨🇦 828 123 1,892ms 23 Oct 2025 125th albanian-laundromat 828 123 2,113ms 26 Oct 2025 127th GolfingSuccess 🇬🇷 827 401 7ms 20 Dec 2024 128th inventshah 822 104 15ms 3 Sep 2023 129th adriweb 🇫🇷 819 151 24ms 1 Sep 2023 130th snoozingnewt 🇨🇦 818 102 435ms 20 Feb 2026 131st trinityy-7 817 126 10ms 10 Oct 2023 132nd SirBogman 🇺🇸 815 237 190ms 27 Sep 2023 133rd anter69 🇭🇺 814 105 10ms 19 Nov 2023 134th inventshah 813 128 479ms 25 Oct 2025 135th pardouin 🇫🇷 809 195 2,469ms 25 Nov 2024 136th SirBogman 🇺🇸 809 251 32ms 23 Sep 2023 137th ovs-code 🇩🇪 807 92 45ms 1 Sep 2023 137th MeWhenI 🇻🇦 807 92 229ms 1 Sep 2023 139th JayXon 🇺🇸 806 129 460ms 8 Oct 2025 140th MostParsingVex 806 269 1,029ms 4 days ago 141st emplv 🇱🇻 804 208 118ms 20 Oct 2023 142nd SirBogman 🇺🇸 803 91 3ms 26 Sep 2023 143rd SirBogman 🇺🇸 803 93 34ms 25 Sep 2023 144th MostParsingVex 801 107 1,416ms 11 hours ago 145th antimon2 🇯🇵 800 128 916ms 9 Oct 2025 146th GolfingSuccess 🇬🇷 799 107 21ms 1 Sep 2023 147th SirBogman 🇺🇸 798 93 229ms 10 Sep 2023 147th emgordon154 798 93 49ms 1 Feb 2026 149th ovs-code 🇩🇪 794 131 482ms 7 Sep 2023 150th rucin93 🇵🇱 792 130 14ms 31 May 2025 151st emgordon154 789 170 455ms 24 days ago 152nd bstrat 786 93 3ms 23 Aug 2024 153rd Alex-x90 🇺🇸 786 107 62ms 16 Dec 2025 154th dmrichwa 🇺🇸 786 131 10ms 4 Sep 2023 155th neel11235813 784 109 18ms 29 Nov 2023 156th JayXon 🇺🇸 783 134 135ms 1 Nov 2025 157th jacobly0 🇺🇸 782 158 1ms 3 Sep 2023 158th sean-niemann 🇺🇸 780 118 134ms 21 Oct 2025 159th GolfingSuccess 🇬🇷 779 107 442ms 15 Jan 2024 160th davitf 777 110 30ms 30 Apr 2024 First Prev 81–160 of 1,413 Next Last