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 bytes. 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 Bytes Time Submitted 801st dokutan 221 584 801ms 10 Dec 2025 802nd gifti258 220 585 187ms 13 Sep 2023 803rd msbranicky 220 594 87ms 1 Sep 2023 804th moustave 219 559 10ms 26 Mar 2025 805th voytxt 🇨🇿 219 609 417ms 4 Nov 2024 806th Ripick 218 343 2ms 22 Oct 2025 807th coreynash 218 563 10ms 16 Feb 2024 808th dokutan 217 564 199ms 18 Mar 2025 809th two-bad 🇬🇧 217 565 10ms 25 Feb 2024 810th ArmaanAS 217 567 10ms 23 Feb 2025 811th Shanethegamer 🇺🇸 217 777 41ms 22 Aug 2024 811th KatieLG 🇬🇧 217 777 40ms 22 Aug 2024 811th dokutan 217 777 41ms 24 Aug 2024 811th HumanoidCPU 217 777 39ms 25 Aug 2024 811th Mabeloid 🇳🇴 217 777 40ms 21 Sep 2024 811th error256 217 777 42ms 10 Jan 2025 811th CaedenHarper 🇨🇦 217 777 39ms 22 Jan 2025 811th gigaprofisi 🇺🇸 217 777 40ms 5 Nov 2025 819th TheZwierzLF 🇵🇱 216 346 2ms 25 Nov 2025 820th msbranicky 216 617 386ms 8 Sep 2023 821st dokutan 215 570 14ms 13 Mar 2025 821st CommandLeo 🇮🇹 215 570 10ms 1 Dec 2025 823rd olleicua 🇺🇸 215 572 14ms 13 Feb 2024 824th denkyuu1 214 453 34ms 18 days ago 825th msbranicky 214 571 180ms 15 Jan 2024 826th HumanoidCPU 214 572 10ms 12 Nov 2025 827th dokutan 214 624 374ms 5 Jun 2024 828th alexsave 213 577 9ms 4 Nov 2025 829th rgthree 212 579 13ms 5 Sep 2023 830th KatieLG 🇬🇧 212 854 6ms 21 Feb 2026 831st olleicua 🇺🇸 211 460 38ms 11 Apr 2024 832nd MichalMarsalek 🇨🇿 211 570 127ms 1 Sep 2023 833rd msbranicky 211 580 9ms 1 Sep 2023 834th CaedenHarper 🇨🇦 211 1,567 2ms 20 Jan 2025 835th msbranicky 210 678 434ms 8 Sep 2023 836th dokutan 210 679 1ms 21 Jun 2025 837th dokutan 210 686 285ms 12 Dec 2025 838th KatieLG 🇬🇧 210 789 124ms 2 Sep 2023 838th Shanethegamer 🇺🇸 210 789 116ms 3 Sep 2023 838th HumanoidCPU 210 789 109ms 27 May 2024 838th RedzGoose 🇦🇺 210 789 114ms 7 Oct 2024 838th CaedenHarper 🇨🇦 210 789 109ms 20 Jan 2025 843rd dokutan 209 569 851ms 16 Jul 2025 844th Mabeloid 🇳🇴 209 794 117ms 21 Sep 2024 845th MarcMush 🇫🇷 208 360 2ms 7 Jan 2024 846th aalec 208 589 10ms 24 Apr 2024 847th iczelia 🇩🇪 208 591 9ms 8 Nov 2025 848th Fanrco 207 591 10ms 4 Sep 2023 849th MeWhenI 🇻🇦 207 800 119ms 1 Sep 2023 849th gigaprofisi 🇺🇸 207 800 114ms 13 Nov 2025 851st kasarino 205 597 10ms 7 Feb 2026 852nd msbranicky 204 590 126ms 3 Oct 2023 853rd andre-lameirinhas 🇵🇹 204 598 10ms 2 Oct 2023 854th msbranicky 204 601 11ms 8 Sep 2023 855th MiranDaniel 🇨🇿 203 602 9ms 2 Sep 2023 856th eiburns 203 603 10ms 1 Sep 2023 856th WillConker 203 603 10ms 22 Oct 2024 858th HumanoidCPU 202 773 2,250ms 24 Oct 2024 858th Shanethegamer 🇺🇸 202 773 2,453ms 24 Oct 2024 858th KatieLG 🇬🇧 202 773 2,316ms 27 Oct 2024 858th CaedenHarper 🇨🇦 202 773 2,269ms 22 Jan 2025 858th Chinay-Domitrix 🇺🇸 202 773 2,239ms 15 Apr 2025 863rd HumanoidCPU 201 571 459ms 12 Nov 2025 864th 0dyse 201 608 10ms 29 Apr 2025 865th zt14427 201 1,648 2ms 28 Sep 2023 866th msbranicky 200 626 4ms 12 Sep 2023 867th KatieLG-Transpiler 🇬🇧 199 833 111ms 2 Sep 2023 868th msbranicky 198 580 473ms 16 Jan 2024 869th stellartux 192 636 304ms 31 Dec 2023 870th Ralac07 🇦🇺 192 640 10ms 18 Apr 2025 871st ridingqwerty 🇺🇸 191 391 2ms 21 Feb 2024 872nd JRaspass 🇬🇧 191 545 3ms 3 Sep 2023 873rd msbranicky 191 614 135ms 1 Oct 2023 874th HumanoidCPU 191 643 11ms 28 May 2024 875th targrik 190 645 10ms 7 Feb 2025 876th MeWhenI 🇻🇦 189 551 3ms 1 Sep 2023 877th Shanethegamer 🇺🇸 189 776 2ms 1 Sep 2023 877th koipondx86 189 776 1ms 15 Feb 2024 877th CaedenHarper 🇨🇦 189 776 1ms 22 Jan 2025 877th HumanoidCPU 189 776 1ms 4 Mar 2025 First Prev 801–880 of 1,442 Next Last