The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 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 399th CaedenHarper 🇨🇦 483 775 2ms 3 days ago 402nd HumanoidCPU 483 776 3ms 1 Jan 2026 402nd KatieLG 🇬🇧 483 776 3ms 21 Feb 2026 404th GolfingSuccess 🇬🇷 482 154 44ms 1 Sep 2023 405th annaproxy 479 280 378ms 24 Sep 2023 406th stefangimmillaro 477 158 1,273ms 9 Sep 2023 407th dokutan 477 429 3ms 19 Aug 2024 408th FlorianCassayre 🇫🇷 474 303 426ms 2 Sep 2023 409th snoozingnewt 🇨🇦 474 314 81ms 14 Oct 2025 410th BambooleanLogic 🇸🇪 472 218 11ms 17 Sep 2023 410th janbehrens 🇩🇪 472 218 9ms 30 Dec 2023 412th KatieLG-Transpiler 🇬🇧 472 838 10ms 2 Sep 2023 413th postie77 471 285 436ms 6 Sep 2023 414th eranws 470 219 10ms 3 Sep 2023 415th guilhem-roy 🇫🇷 467 183 10ms 10 Jul 2024 416th adamnielson42 🇺🇸 465 381 131ms 20 Dec 2023 417th Natanaelel 🇸🇪 461 162 35ms 28 Nov 2023 418th dokutan 460 269 1ms 28 Mar 2025 419th stefangimmillaro 457 187 2,829ms 9 Sep 2023 419th Mabeloid 🇳🇴 457 187 14ms 17 Sep 2024 419th FortuiteMan 🇫🇷 457 187 10ms 27 Nov 2025 422nd stefangimmillaro 457 204 27ms 17 Sep 2023 422nd targrik 457 204 6ms 15 May 2025 424th rucin93 🇵🇱 453 203 156ms 3 Aug 2024 425th helbling 🇨🇭 452 228 9ms 25 Jul 2024 426th MeWhenI 🇻🇦 452 449 30ms 6 Sep 2023 427th inventshah 450 180 56ms 3 Sep 2023 428th Languag3 450 190 11ms 22 Jan 2026 429th blaztoma 🇱🇹 446 169 38ms 19 Oct 2025 430th Mabeloid 🇳🇴 446 187 455ms 17 Sep 2024 431st luuumine 🇫🇷 445 236 119ms 26 Nov 2025 431st elgan65536 🇺🇸 445 236 125ms 20 days ago 433rd CaedenHarper 🇨🇦 443 193 148ms 14 Aug 2025 434th dokutan 442 401 3ms 13 Apr 2024 435th error256 441 303 9ms 20 Jul 2024 436th Aurel300 🇨🇭 439 239 126ms 8 Jun 2024 437th MeWhenI 🇻🇦 436 775 1ms 1 Sep 2023 437th Shanethegamer 🇺🇸 436 775 1ms 1 Sep 2023 437th snoozingnewt 🇨🇦 436 775 1ms 5 Sep 2023 437th DialFrost 🇸🇬 436 775 2ms 7 Sep 2023 437th dokutan 436 775 2ms 10 Sep 2023 437th HumanoidCPU 436 775 2ms 16 Apr 2024 437th weliveinhell 🇭🇹 436 775 1ms 7 Jun 2024 437th Mabeloid 🇳🇴 436 775 1ms 21 Sep 2024 437th CaedenHarper 🇨🇦 436 775 1ms 22 Jan 2025 437th fuzzylojik-golf 🇺🇸 436 775 1ms 8 Jul 2025 437th JOrE20 436 775 1ms 10 Nov 2025 448th KatieLG-Transpiler 🇬🇧 436 776 2ms 2 Sep 2023 449th dokutan 435 355 6ms 23 Jan 2026 450th RaBa21 🇭🇺 434 197 21ms 1 Aug 2025 451st gigaprofisi 🇺🇸 434 237 11ms 16 Jul 2025 452nd CaedenHarper 🇨🇦 432 193 580ms 14 Aug 2025 453rd MeWhenI 🇻🇦 432 213 181ms 3 Aug 2024 454th lionbryce 429 288 1ms 7 Aug 2024 455th HumanoidCPU 429 773 3ms 12 Dec 2024 455th dokutan 429 773 3ms 12 Dec 2024 455th KatieLG 🇬🇧 429 773 3ms 3 Jan 2025 455th Shanethegamer 🇺🇸 429 773 3ms 11 Jan 2025 455th BREMAUCY 🇫🇷 429 773 3ms 14 Jan 2025 455th CaedenHarper 🇨🇦 429 773 3ms 22 Jan 2025 455th JOrE20 429 773 4ms 30 Nov 2025 462nd Yewzir 🇧🇪 427 338 2ms 27 Mar 2024 463rd msbranicky 424 932 11ms 19 Sep 2023 464th InigoK 🇺🇸 423 202 156ms 10 Sep 2025 465th Yewzir 🇧🇪 423 317 423ms 17 Oct 2024 466th inventshah 423 541 3ms 1 Sep 2023 466th IanUtley 423 541 2ms 1 Sep 2023 466th MeWhenI 🇻🇦 423 541 2ms 3 Sep 2023 466th retrohun 423 541 2ms 6 Sep 2023 466th sisyphus-ppcg 🇦🇺 423 541 2ms 21 Sep 2023 466th Steffan153 🇫🇮 423 541 2ms 23 Sep 2023 466th dokutan 423 541 3ms 3 Oct 2023 466th neel11235813 423 541 2ms 22 Oct 2023 466th galloj 🇨🇿 423 541 2ms 24 Nov 2023 466th kritixilithos 423 541 2ms 1 Jun 2024 466th stefangimmillaro 423 541 2ms 14 Jul 2025 477th error256 422 542 2ms 31 May 2024 477th fuzzylojik-golf 🇺🇸 422 542 2ms 8 Jul 2025 479th weliveinhell 🇭🇹 421 543 2ms 6 Jan 2024 480th klixel 🇨🇦 419 204 3,442ms 20 Jul 2025 First Prev 401–480 of 1,412 Next Last