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 721st dokutan 254 652 115ms 29 Dec 2025 722nd MeWhenI 🇻🇦 253 774 3ms 1 Sep 2023 722nd Shanethegamer 🇺🇸 253 774 3ms 1 Sep 2023 722nd KatieLG 🇬🇧 253 774 2ms 2 Sep 2023 722nd KatieLG-Transpiler 🇬🇧 253 774 3ms 2 Sep 2023 722nd snoozingnewt 🇨🇦 253 774 2ms 11 Oct 2023 722nd theunofficialcoder 253 774 3ms 7 Jan 2024 722nd HumanoidCPU 253 774 3ms 16 Apr 2024 722nd Mabeloid 🇳🇴 253 774 3ms 21 Sep 2024 722nd xyangst 253 774 3ms 12 Oct 2024 722nd CaedenHarper 🇨🇦 253 774 2ms 22 Jan 2025 722nd ehulinsky 🇺🇸 253 774 3ms 26 Mar 2025 733rd JOrE20 252 382 153ms 11 Feb 2026 734th AbhilashaTandon 249 492 10ms 21 Sep 2023 735th msbranicky 248 590 1ms 28 Sep 2023 736th blaztoma 🇱🇹 247 540 418ms 6 Sep 2025 737th Yewzir 🇧🇪 247 578 1ms 27 Mar 2024 738th KatieLG 🇬🇧 247 776 5ms 11 Dec 2023 738th Shanethegamer 🇺🇸 247 776 5ms 11 Dec 2023 738th MeWhenI 🇻🇦 247 776 5ms 13 Dec 2023 738th theunofficialcoder 247 776 6ms 12 Jan 2024 738th HumanoidCPU 247 776 5ms 16 Apr 2024 738th KatieLG-Transpiler 🇬🇧 247 776 7ms 16 Aug 2024 738th Mabeloid 🇳🇴 247 776 5ms 21 Sep 2024 738th CaedenHarper 🇨🇦 247 776 5ms 20 Jan 2025 738th Babafaba 247 776 6ms 29 Oct 2025 738th JOrE20 247 776 6ms 10 Feb 2026 748th fgrosshans 🇫🇷 246 498 15ms 1 Sep 2023 749th neihousaigaai 244 502 9ms 12 Feb 2024 750th isaiah0311 🇺🇸 243 308 2ms 30 Jan 2026 751st dokutan 242 588 361ms 24 Sep 2025 752nd dokutan 242 791 122ms 18 Oct 2024 753rd MeWhenI 🇻🇦 241 779 8ms 1 Sep 2023 753rd Shanethegamer 🇺🇸 241 779 9ms 1 Sep 2023 753rd HumanoidCPU 241 779 9ms 16 Apr 2024 753rd Mabeloid 🇳🇴 241 779 9ms 21 Sep 2024 753rd dokutan 241 779 9ms 18 Oct 2024 753rd CaedenHarper 🇨🇦 241 779 10ms 22 Jan 2025 759th Shanethegamer 🇺🇸 241 795 109ms 1 Sep 2023 759th KatieLG 🇬🇧 241 795 114ms 2 Sep 2023 759th KatieLG-Transpiler 🇬🇧 241 795 109ms 2 Sep 2023 759th msbranicky 241 795 111ms 11 Sep 2023 759th HumanoidCPU 241 795 104ms 16 Apr 2024 759th Mabeloid 🇳🇴 241 795 123ms 21 Sep 2024 759th CaedenHarper 🇨🇦 241 795 109ms 21 Jan 2025 759th JOrE20 241 795 118ms 10 Feb 2026 767th msbranicky 240 596 2ms 10 Oct 2023 768th snoozingnewt 🇨🇦 240 798 105ms 4 Sep 2023 769th MeWhenI 🇻🇦 240 800 109ms 1 Sep 2023 770th MeWhenI 🇻🇦 237 776 5ms 1 Sep 2023 770th Shanethegamer 🇺🇸 237 776 5ms 1 Sep 2023 770th KatieLG 🇬🇧 237 776 5ms 2 Sep 2023 770th KatieLG-Transpiler 🇬🇧 237 776 5ms 2 Sep 2023 770th scpchicken 🇵🇼 237 776 5ms 14 Nov 2023 770th HumanoidCPU 237 776 5ms 4 May 2024 770th dokutan 237 776 5ms 24 Jun 2024 770th Mabeloid 🇳🇴 237 776 5ms 21 Sep 2024 770th CaedenHarper 🇨🇦 237 776 5ms 20 Jan 2025 779th Jacob385 237 2,150 5ms 4 Aug 2024 780th dokutan 236 506 126ms 27 Dec 2025 781st snoozingnewt 🇨🇦 235 781 5ms 5 Sep 2023 782nd KatieLG 🇬🇧 235 797 9ms 2 Sep 2023 782nd KatieLG-Transpiler 🇬🇧 235 797 9ms 2 Sep 2023 784th msbranicky 233 678 1,676ms 17 Sep 2025 785th cbrt-x 233 821 109ms 9 Oct 2023 786th scpchicken 🇵🇼 229 454 5ms 1 Nov 2023 787th BREMAUCY 🇫🇷 227 329 2ms 1 Nov 2025 788th retrohun 227 563 2ms 14 days ago 789th bac0id 227 587 375ms 9 Jan 2025 790th msbranicky 227 635 284ms 1 Sep 2023 791st KatieLG-Transpiler 🇬🇧 227 2,253 5ms 2 Sep 2023 792nd FortuiteMan 🇫🇷 225 231 56ms 3 Dec 2025 793rd dokutan 225 569 2ms 6 Jun 2024 794th KatieLG 🇬🇧 225 2,269 5ms 28 Sep 2024 795th alphafalfa 224 572 15ms 1 Aug 2025 796th HumanoidCPU 224 809 6ms 12 Nov 2025 796th dokutan 224 809 6ms 21 Feb 2026 796th CaedenHarper 🇨🇦 224 809 6ms 22 Feb 2026 799th thisishowmymindworks 🇳🇴 221 557 10ms 15 Jun 2024 799th voytxt 🇨🇿 221 557 9ms 7 Aug 2024 First Prev 721–800 of 1,442 Next Last