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 560th alexsave 570 146 11ms 15 Nov 2025 562nd Pena86 570 195 18ms 14 Sep 2022 563rd alphafalfa 568 110 6ms 25 Oct 2024 564th emgordon154 568 374 1,673ms 21 Dec 2025 565th tatzyr 🇯🇵 567 133 36ms 18 Feb 2025 566th DialFrost 🇸🇬 567 143 301ms 16 Jun 2024 567th voytxt 🇨🇿 564 197 17ms 1 Mar 2023 568th Schmitt-Very-Cool 564 252 488ms 30 Sep 2025 569th bac0id 563 191 115ms 29 Jun 2024 570th bac0id 563 223 404ms 29 Jun 2024 571st Lv0Sys 🇵🇱 562 148 15ms 25 days ago 572nd the-zammers 562 222 146ms 15 Oct 2023 573rd MeWhenI 🇻🇦 561 157 1,032ms 23 Jun 2024 574th emgordon154 561 220 4ms 3 Jan 2025 575th SirBogman 🇺🇸 560 86 34ms 9 Jan 2023 576th lifthrasiir 🇰🇷 558 85 4ms 27 Nov 2024 577th shinh 558 135 35ms 25 Jun 2022 577th emgordon154 558 135 38ms 12 Sep 2024 579th alemelis 558 155 288ms 22 Sep 2024 580th 386asm 🇺🇸 557 214 37ms 4 May 2023 581st 0dyse 556 200 17ms 13 Sep 2025 582nd Shanethegamer 🇺🇸 555 283 230ms 11 May 2022 583rd yzhs 🇩🇪 553 201 18ms 5 Jun 2022 584th madeforlosers 551 151 10ms 23 Oct 2024 584th tomh1012 551 151 27ms 12 days ago 586th olivermrose 🇺🇸 550 137 39ms 9 May 2022 587th jacobly0 🇺🇸 550 192 2ms 13 Sep 2023 588th MeWhenI 🇻🇦 547 218 39ms 23 Jun 2024 589th bac0id 547 260 412ms 29 Jun 2024 590th varhammer 547 288 6ms 13 Dec 2023 591st MeWhenI 🇻🇦 546 117 9ms 23 Jun 2024 592nd Alessandro-Balconi 🇮🇹 546 183 117ms 15 May 2023 593rd weliveinhell 🇭🇹 546 199 2ms 21 May 2024 594th Bubbler-4 545 87 18ms 9 May 2022 595th levikeck 545 229 145ms 5 Feb 2024 596th MeWhenI 🇻🇦 543 115 2ms 11 Nov 2022 597th Haksell 🇦🇶 542 139 34ms 23 Feb 2023 598th adamnielson42 🇺🇸 542 205 10ms 14 Apr 2023 599th 2bular 541 89 33ms 30 Jan 2026 600th dokutan 541 219 298ms 24 Mar 2025 601st KatieLG 🇬🇧 541 232 390ms 13 Oct 2024 602nd Yewzir 🇧🇪 539 191 2ms 7 May 2024 603rd alexeldridge 539 206 17ms 8 Aug 2024 603rd celiendonze 🇨🇭 539 206 12ms 21 Jan 2026 605th eiburns 537 207 17ms 26 Oct 2023 606th brimstonetrader 536 233 143ms 20 Mar 2024 607th adoxography 535 141 38ms 2 Mar 2024 607th TheZwierzLF 🇵🇱 535 141 35ms 5 Jan 2026 609th yuchuehw 534 208 17ms 25 Feb 2024 610th HumanoidCPU 533 248 370ms 8 Aug 2024 611th scpchicken 🇵🇼 532 136 150ms 8 May 2022 612th Babafaba 532 209 16ms 24 Nov 2025 613th HumanoidCPU 531 142 39ms 7 Aug 2024 614th helbling 🇨🇭 530 157 10ms 3 Oct 2024 615th emgordon154 530 205 2ms 28 Dec 2024 616th dokutan 529 316 41ms 27 Aug 2024 617th albanian-laundromat 527 296 2ms 29 Aug 2025 618th emgordon154 526 76 47ms 9 Dec 2025 619th janbehrens 🇩🇪 526 126 3ms 22 May 2022 620th The3gs 522 301 190ms 28 Nov 2024 621st yzhs 🇩🇪 521 241 392ms 5 Jun 2022 622nd Yewzir 🇧🇪 520 209 2ms 10 Jun 2024 623rd msbranicky 517 199 2ms 13 Oct 2023 624th error256 516 215 73ms 21 May 2025 625th msbranicky 513 304 2ms 12 Aug 2023 626th scpchicken 🇵🇼 510 130 6ms 29 Dec 2022 627th IISResetMe 510 159 316ms 3 Jan 2026 628th dokutan 510 290 12ms 14 May 2024 629th MeWhenI 🇻🇦 508 309 237ms 25 May 2022 630th msbranicky 507 194 597ms 17 Jan 2024 631st adriweb 🇫🇷 506 209 2ms 29 Aug 2023 632nd Jacob385 506 281 487ms 1 Feb 2025 633rd dillon-duncando 505 220 11ms 3 Oct 2022 634th Shanethegamer 🇺🇸 504 349 68ms 20 May 2022 635th NoneTheFewer 500 222 11ms 25 Dec 2025 636th Shanethegamer 🇺🇸 499 133 3ms 12 May 2022 636th MeWhenI 🇻🇦 499 133 5ms 16 Apr 2023 638th HumanoidCPU 497 238 2,738ms 26 Oct 2024 639th albanian-laundromat 493 182 1,235ms 22 Sep 2025 640th Natanaelel 🇸🇪 492 147 141ms 13 Nov 2022 First Prev 561–640 of 731 Next Last