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 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 561st SirBogman 🇺🇸 571 185 2ms 21 May 2022 562nd coreynash 570 146 10ms 19 Oct 2023 562nd alexsave 570 146 13ms 15 Nov 2025 564th Pena86 570 195 18ms 14 Sep 2022 565th alphafalfa 568 110 6ms 25 Oct 2024 566th emgordon154 568 374 1,673ms 21 Dec 2025 567th tatzyr 🇯🇵 567 133 36ms 18 Feb 2025 568th DialFrost 🇸🇬 567 143 301ms 16 Jun 2024 569th voytxt 🇨🇿 564 197 17ms 1 Mar 2023 570th Schmitt-Very-Cool 564 252 488ms 30 Sep 2025 571st bac0id 563 191 115ms 29 Jun 2024 572nd bac0id 563 223 404ms 29 Jun 2024 573rd Lv0Sys 🇵🇱 562 148 10ms 27 Feb 2026 574th the-zammers 562 222 146ms 15 Oct 2023 575th MeWhenI 🇻🇦 561 157 1,032ms 23 Jun 2024 576th emgordon154 561 220 4ms 3 Jan 2025 577th SirBogman 🇺🇸 560 86 34ms 9 Jan 2023 578th lifthrasiir 🇰🇷 558 85 4ms 27 Nov 2024 579th shinh 558 135 35ms 25 Jun 2022 579th emgordon154 558 135 38ms 12 Sep 2024 581st alemelis 558 155 288ms 22 Sep 2024 582nd 386asm 🇺🇸 557 214 37ms 4 May 2023 583rd 0dyse 556 200 17ms 13 Sep 2025 584th Shanethegamer 🇺🇸 555 283 257ms 11 May 2022 585th yzhs 🇩🇪 553 201 18ms 5 Jun 2022 586th madeforlosers 551 151 11ms 23 Oct 2024 586th tomh1012 551 151 14ms 16 days ago 588th olivermrose 🇺🇸 550 137 39ms 9 May 2022 589th jacobly0 🇺🇸 550 192 2ms 13 Sep 2023 590th weliveinhell 🇭🇹 547 199 2ms 21 May 2024 591st MeWhenI 🇻🇦 547 218 39ms 23 Jun 2024 592nd bac0id 547 260 412ms 29 Jun 2024 593rd varhammer 547 288 6ms 13 Dec 2023 594th MeWhenI 🇻🇦 546 117 9ms 23 Jun 2024 595th Alessandro-Balconi 🇮🇹 546 183 117ms 15 May 2023 596th Bubbler-4 545 87 18ms 9 May 2022 597th levikeck 545 229 145ms 5 Feb 2024 598th MeWhenI 🇻🇦 543 115 2ms 11 Nov 2022 599th Haksell 🇦🇶 542 139 34ms 23 Feb 2023 600th adamnielson42 🇺🇸 542 205 10ms 14 Apr 2023 601st 2bular 541 89 33ms 30 Jan 2026 602nd dokutan 541 219 298ms 24 Mar 2025 603rd KatieLG 🇬🇧 541 232 390ms 13 Oct 2024 604th Yewzir 🇧🇪 539 191 2ms 7 May 2024 605th alexeldridge 539 206 17ms 8 Aug 2024 605th celiendonze 🇨🇭 539 206 12ms 21 Jan 2026 607th eiburns 537 207 17ms 26 Oct 2023 608th brimstonetrader 536 233 143ms 20 Mar 2024 609th adoxography 535 141 38ms 2 Mar 2024 609th TheZwierzLF 🇵🇱 535 141 35ms 5 Jan 2026 611th yuchuehw 534 208 17ms 25 Feb 2024 612th HumanoidCPU 534 248 370ms 8 Aug 2024 613th scpchicken 🇵🇼 532 136 150ms 8 May 2022 614th Babafaba 532 209 16ms 24 Nov 2025 615th HumanoidCPU 531 142 39ms 7 Aug 2024 616th emgordon154 531 205 2ms 28 Dec 2024 617th helbling 🇨🇭 530 157 13ms 3 Oct 2024 618th dokutan 529 316 41ms 27 Aug 2024 619th albanian-laundromat 527 296 2ms 29 Aug 2025 620th emgordon154 526 76 47ms 9 Dec 2025 621st janbehrens 🇩🇪 526 126 3ms 22 May 2022 622nd The3gs 522 301 193ms 28 Nov 2024 623rd Yewzir 🇧🇪 521 209 2ms 10 Jun 2024 624th yzhs 🇩🇪 521 241 392ms 5 Jun 2022 625th msbranicky 517 199 2ms 13 Oct 2023 626th error256 516 215 73ms 21 May 2025 627th msbranicky 513 304 2ms 12 Aug 2023 628th scpchicken 🇵🇼 510 130 6ms 29 Dec 2022 629th IISResetMe 510 159 316ms 3 Jan 2026 630th dokutan 510 290 12ms 14 May 2024 631st MeWhenI 🇻🇦 508 309 244ms 25 May 2022 632nd msbranicky 507 194 597ms 17 Jan 2024 633rd adriweb 🇫🇷 506 209 2ms 29 Aug 2023 634th Jacob385 506 281 487ms 1 Feb 2025 635th dillon-duncando 505 220 11ms 3 Oct 2022 636th Shanethegamer 🇺🇸 504 349 68ms 20 May 2022 637th NoneTheFewer 501 222 11ms 25 Dec 2025 638th Shanethegamer 🇺🇸 499 133 3ms 12 May 2022 638th MeWhenI 🇻🇦 499 133 5ms 16 Apr 2023 640th HumanoidCPU 497 238 2,738ms 26 Oct 2024 First Prev 561–640 of 734 Next Last