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?
Jacobi Symbol 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 401st stefangimmillaro 660 163 112ms 15 Jul 2023 402nd elgan65536 🇺🇸 660 238 226ms 9 Mar 2024 403rd MeWhenI 🇻🇦 660 239 7ms 23 Jun 2024 404th MeWhenI 🇻🇦 660 271 33ms 23 Jun 2024 405th roavin 659 165 2ms 26 May 2022 406th Shanethegamer 🇺🇸 658 185 477ms 7 Jun 2022 407th jtaxen 657 169 18ms 1 Apr 2024 407th JunkIce 657 169 19ms 25 Nov 2024 407th Andrey2001 657 169 16ms 17 Dec 2025 410th Shanethegamer 🇺🇸 657 190 147ms 12 May 2022 411th GolfingSuccess 🇬🇷 656 61 51ms 14 Aug 2022 412th HumanoidCPU 656 150 540ms 31 Oct 2024 413th MeWhenI 🇻🇦 656 189 457ms 23 Jun 2024 414th janAkali 🇷🇺 656 202 389ms 4 hours ago 415th janlelis 655 115 37ms 19 Sep 2024 416th Sakisan 🇧🇪 655 127 9ms 12 May 2022 416th janbehrens 🇩🇪 655 127 11ms 3 Jul 2023 418th CatsAreFluffy 655 166 2ms 25 Jan 2023 418th Alex-x90 🇺🇸 655 166 1ms 14 Dec 2023 420th janbehrens 🇩🇪 655 217 356ms 3 Jul 2023 421st Alex-x90 🇺🇸 654 170 18ms 15 Dec 2023 421st TheZwierzLF 🇵🇱 654 170 17ms 22 May 2025 423rd Shanethegamer 🇺🇸 654 241 7ms 4 Oct 2024 424th CatsAreFluffy 653 190 64ms 30 Dec 2022 425th MeWhenI 🇻🇦 652 124 1,248ms 25 May 2022 426th Shanethegamer 🇺🇸 652 135 1,030ms 12 May 2022 427th duckyluuk 🇳🇱 651 151 498ms 19 Jun 2024 427th bizy-coder 651 151 503ms 27 Nov 2025 429th olleicua 🇺🇸 650 116 38ms 19 Feb 2025 430th itsh01 650 128 10ms 4 Jul 2022 431st snoozingnewt 🇨🇦 650 195 110ms 20 Nov 2025 432nd MichalMarsalek 🇨🇿 650 204 406ms 20 May 2022 432nd MeWhenI 🇻🇦 650 204 403ms 26 Aug 2023 434th Shanethegamer 🇺🇸 647 125 1,200ms 11 May 2022 434th stefangimmillaro 647 125 1,318ms 15 Jul 2023 436th roavin 647 194 396ms 26 May 2022 437th Shanethegamer 🇺🇸 646 147 5ms 11 May 2022 438th SniperSmiley 🇺🇸 646 172 18ms 29 Jun 2022 438th adoxography 646 172 17ms 8 Aug 2022 438th SB-945 646 172 17ms 24 Jan 2024 441st inventshah 646 220 418ms 13 May 2022 442nd MeWhenI 🇻🇦 644 189 474ms 23 Jun 2024 443rd m-tkach 🇺🇦 644 273 65ms 7 Feb 2023 444th neel11235813 643 153 557ms 27 Mar 2024 445th prestosilver 🇺🇸 643 206 365ms 3 hours ago 446th neihousaigaai 642 173 10ms 17 May 2022 447th bac0id 642 193 434ms 29 Jun 2024 448th dmrichwa 🇺🇸 640 130 11ms 15 Jun 2022 449th Bonjour27891 🇻🇳 639 174 17ms 5 Jul 2022 450th GrayJoKing 🇦🇺 638 149 5ms 20 May 2022 450th DialFrost 🇸🇬 638 149 4ms 15 Jan 2024 452nd scpchicken 🇵🇼 636 247 241ms 4 Feb 2023 453rd KrausRaus 🇺🇸 635 131 10ms 12 May 2022 454th croc54 635 175 18ms 8 Jan 2025 455th GrayJoKing 🇦🇺 635 268 20ms 6 Dec 2025 456th annaproxy 634 198 401ms 10 May 2022 457th targrik 633 150 7ms 24 Jan 2025 458th Shanethegamer 🇺🇸 631 137 326ms 9 May 2022 459th MichalMarsalek 🇨🇿 631 176 10ms 20 May 2022 459th dokutan 631 176 10ms 23 Jun 2024 459th RaBa21 🇭🇺 631 176 18ms 19 Jul 2025 462nd yzhs 🇩🇪 631 198 143ms 23 Jun 2022 463rd CaedenHarper 🇨🇦 631 199 362ms 17 Oct 2025 464th bac0id 629 173 1ms 29 Jun 2024 465th fgrosshans 🇫🇷 628 177 11ms 3 Nov 2022 466th Ripick 628 211 392ms 18 Aug 2024 467th GrayJoKing 🇦🇺 626 106 3ms 20 May 2022 468th janbehrens 🇩🇪 626 138 292ms 12 May 2022 469th stefangimmillaro 625 133 9ms 19 Sep 2024 470th janbehrens 🇩🇪 625 152 5ms 3 Jul 2023 471st tomh1012 625 201 440ms 12 days ago 472nd edsrzf 🇳🇿 625 212 405ms 23 Jul 2025 473rd MaxElf999 624 178 17ms 27 Sep 2022 473rd za3k 624 178 11ms 14 Dec 2022 473rd jmerle 🇳🇱 624 178 17ms 11 Jul 2023 476th anter69 🇭🇺 623 121 42ms 7 Jan 2024 477th c0d3-4-F00d 🇩🇪 622 175 2ms 23 May 2022 478th CaedenHarper 🇨🇦 621 134 14ms 6 Nov 2025 479th MeWhenI 🇻🇦 621 148 156ms 25 Oct 2024 480th DialFrost 🇸🇬 621 251 2ms 26 May 2024 First Prev 401–480 of 733 Next Last