The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 days. Why not try and solve them ahead of time?
Jacobi Symbol in Python 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 80th TaserTheFox 🇺🇸 553 152 17ms 26 May 2023 80th Lv0Sys 🇵🇱 553 152 11ms 27 Feb 2026 83rd janbehrens 🇩🇪 549 153 31ms 17 Jun 2023 84th qpwoeirut 545 154 11ms 2 Oct 2025 84th CaedenHarper 🇨🇦 545 154 32ms 6 Nov 2025 86th YAJUE114514 542 155 10ms 15 Aug 2025 87th CedricGebistorf 535 157 11ms 5 May 2023 88th Just4FunCoder 532 158 17ms 26 Mar 2023 89th guilhem-roy 🇫🇷 528 159 18ms 9 May 2022 89th OllieBoyne 🇬🇧 528 159 10ms 13 May 2022 89th TobyBoyne 🇬🇧 528 159 10ms 13 May 2022 92nd nstearns96 🇬🇧 525 160 10ms 15 Dec 2022 92nd ahmetdemirag 🇨🇾 525 160 18ms 6 Mar 2025 94th rak1507 🇬🇧 522 161 17ms 8 Feb 2023 94th StefanHabel 🇨🇦 522 161 17ms 26 Mar 2023 96th CLOStrophobic 🇮🇹 519 162 18ms 23 Jan 2025 96th andrewjc2000 519 162 17ms 18 Aug 2025 98th RYNO8 509 165 18ms 16 Aug 2022 98th inverseLorentz 🇦🇺 509 165 11ms 24 Mar 2024 98th edsrzf 🇳🇿 509 165 10ms 20 days ago 101st BREMAUCY 🇫🇷 506 166 17ms 30 May 2023 102nd RDShah 503 167 12ms 22 May 2022 103rd aksyristos 500 168 18ms 25 Jan 2023 104th jtaxen 497 169 18ms 1 Apr 2024 104th Andrey2001 497 169 16ms 17 Dec 2025 106th Alex-x90 🇺🇸 494 170 18ms 15 Dec 2023 106th TheZwierzLF 🇵🇱 494 170 17ms 22 May 2025 108th SniperSmiley 🇺🇸 488 172 18ms 29 Jun 2022 108th adoxography 488 172 17ms 8 Aug 2022 110th neihousaigaai 486 173 10ms 17 May 2022 111th Bonjour27891 🇻🇳 483 174 17ms 5 Jul 2022 112th croc54 480 175 18ms 8 Jan 2025 113th MichalMarsalek 🇨🇿 477 176 10ms 20 May 2022 114th fgrosshans 🇫🇷 475 177 11ms 3 Nov 2022 115th MaxElf999 472 178 17ms 27 Sep 2022 115th za3k 472 178 11ms 14 Dec 2022 117th Eilonlif 🇮🇱 464 181 11ms 15 Feb 2024 117th Aquateraneal 🇺🇸 464 181 12ms 19 days ago 119th mbittner20 462 182 11ms 27 May 2023 119th rollershutter 462 182 11ms 4 Jul 2024 121st tomh1012 459 183 17ms 24 Feb 2026 122nd sleepyStick 457 184 17ms 15 Jul 2022 123rd SirFireball3521 454 185 19ms 6 Mar 2023 123rd CutSandstone 454 185 17ms 4 Jul 2024 125th nullie 452 186 18ms 8 Jun 2022 126th scpchicken 🇵🇼 449 187 17ms 4 Feb 2023 127th martinnorling 🇸🇪 447 188 17ms 10 May 2022 127th bac0id 447 188 17ms 5 Jul 2024 129th AstroOrbis 444 189 17ms 12 Jul 2025 130th hiichbindermax 442 190 18ms 8 Feb 2023 131st jhpaques 🇫🇷 440 191 17ms 26 Jul 2022 131st hellwue 440 191 19ms 8 Feb 2023 133rd madeforlosers 438 192 18ms 13 Nov 2025 134th msbranicky 435 193 17ms 10 Aug 2023 135th Pena86 431 195 18ms 14 Sep 2022 136th voytxt 🇨🇿 426 197 17ms 1 Mar 2023 137th 0dyse 420 200 17ms 13 Sep 2025 138th adamnielson42 🇺🇸 410 205 10ms 14 Apr 2023 139th alexeldridge 408 206 17ms 8 Aug 2024 139th celiendonze 🇨🇭 408 206 12ms 21 Jan 2026 141st eiburns 406 207 17ms 26 Oct 2023 142nd yuchuehw 404 208 17ms 25 Feb 2024 143rd dillon-duncando 382 220 11ms 3 Oct 2022 144th NoneTheFewer 378 222 11ms 25 Dec 2025 145th AtengChen 329 255 11ms 24 Aug 2024 146th mathisfun271 324 259 11ms 4 Feb 2024 147th ComputerKWasTaken 🇺🇸 322 261 17ms 9 Jun 2024 148th Bananapants22 309 272 11ms 8 Sep 2022 149th Zhenyu-Bo 298 282 9ms 31 Jul 2025 150th dylanjones92 290 290 12ms 26 Jan 2024 151st madex 🇩🇪 289 291 10ms 8 May 2024 152nd gsprochette 275 306 18ms 21 Aug 2025 153rd cros107 🇦🇺 270 311 11ms 9 Sep 2025 154th shibacho 🇯🇵 241 349 18ms 16 Nov 2022 155th 104210 216 388 11ms 26 Aug 2022 156th KatieLG-Transpiler 🇬🇧 204 412 10ms 23 Jun 2022 157th muser-logiccpu 🇺🇦 200 421 11ms 25 Jul 2025 158th AidanWalter 118 709 11ms 3 Jan 2025 First Prev 81–158 of 158