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 481st KatieLG 🇬🇧 619 159 534ms 15 Jan 2024 481st commandz0 🇺🇸 619 159 467ms 1 Sep 2025 481st TheZwierzLF 🇵🇱 619 159 538ms 23 Nov 2025 484th Lv0Sys 🇵🇱 618 122 35ms 7 Dec 2025 485th IanUtley 615 188 120ms 15 Nov 2023 486th Yewzir 🇧🇪 615 345 1,685ms 24 May 2024 487th Eilonlif 🇮🇱 614 181 11ms 15 Feb 2024 487th Aquateraneal 🇺🇸 614 181 12ms 15 days ago 489th DialFrost 🇸🇬 613 123 34ms 1 Jun 2024 490th zakariamouhid 612 136 11ms 11 May 2023 490th gigaprofisi 🇺🇸 612 136 10ms 10 Aug 2025 492nd JunkIce 611 161 563ms 3 Dec 2024 493rd SirBogman 🇺🇸 611 419 18ms 27 Dec 2023 494th mbittner20 610 182 11ms 27 May 2023 494th rollershutter 610 182 11ms 4 Jul 2024 494th wh3n3v3r 🇨🇿 610 182 10ms 11 Nov 2024 497th anter69 🇭🇺 608 133 1,239ms 16 Feb 2023 498th voytxt 🇨🇿 607 137 13ms 9 May 2022 498th KatieLG 🇬🇧 607 137 10ms 24 Oct 2022 500th tomh1012 607 183 17ms 24 Feb 2026 501st SirBogman 🇺🇸 607 235 1,404ms 26 May 2022 502nd MeWhenI 🇻🇦 606 66 53ms 30 Jul 2025 503rd MeWhenI 🇻🇦 606 165 10ms 16 Aug 2024 504th annaproxy 606 191 20ms 23 Oct 2022 505th Natanaelel 🇸🇪 606 206 135ms 9 May 2022 505th annaproxy 606 206 142ms 3 Jun 2022 507th MeWhenI 🇻🇦 605 117 8ms 18 May 2022 508th stefangimmillaro 605 213 44ms 15 Jul 2023 509th MeWhenI 🇻🇦 604 143 264ms 23 Jun 2024 510th sleepyStick 604 184 17ms 15 Jul 2022 511th klixel 🇨🇦 604 260 225ms 9 Jun 2023 512th MeWhenI 🇻🇦 603 149 1,099ms 15 Sep 2025 513th SirBogman 🇺🇸 603 192 117ms 6 Oct 2025 514th tobeannouncd 603 207 137ms 2 Jan 2024 515th jared-hughes 602 106 21ms 19 Jul 2022 516th SirFireball3521 601 185 19ms 6 Mar 2023 516th CutSandstone 601 185 17ms 4 Jul 2024 518th MeWhenI 🇻🇦 599 215 41ms 23 Jun 2024 519th Shanethegamer 🇺🇸 598 126 35ms 9 May 2022 520th emgordon154 598 167 15ms 27 Aug 2024 521st nullie 597 186 18ms 8 Jun 2022 522nd amazingalek 🇳🇴 595 211 427ms 26 Jan 2026 523rd scpchicken 🇵🇼 594 187 17ms 4 Feb 2023 524th Yewzir 🇧🇪 593 166 549ms 7 May 2024 525th MeWhenI 🇻🇦 592 137 317ms 29 Jan 2023 526th hamhub7 592 212 399ms 8 Aug 2022 527th martinnorling 🇸🇪 591 188 17ms 10 May 2022 527th bac0id 591 188 17ms 5 Jul 2024 529th AstroOrbis 588 189 17ms 12 Jul 2025 530th SirBogman 🇺🇸 588 219 44ms 4 Nov 2024 531st retrohun 586 109 13ms 12 Oct 2024 532nd dokutan 586 168 536ms 23 Jun 2024 533rd Yewzir 🇧🇪 586 202 278ms 27 Oct 2023 534th fantaize 586 268 203ms 14 days ago 535th hiichbindermax 585 190 18ms 8 Feb 2023 535th albanian-laundromat 585 190 17ms 12 Jul 2025 535th robin-scragg 585 190 17ms 3 Oct 2025 538th Yewzir 🇧🇪 584 215 420ms 22 Dec 2024 539th eranws 582 143 11ms 23 Oct 2022 539th AlephSquirrel 582 143 14ms 21 Dec 2022 541st Andrey2001 582 169 485ms 28 Jan 2026 542nd jhpaques 🇫🇷 582 191 17ms 26 Jul 2022 542nd hellwue 582 191 19ms 8 Feb 2023 544th blaztoma 🇱🇹 580 130 37ms 11 Oct 2025 545th madeforlosers 579 192 18ms 13 Nov 2025 546th two-bad 🇬🇧 578 144 11ms 9 Feb 2024 547th DialFrost 🇸🇬 578 178 2ms 29 Jan 2024 548th rifatx 578 205 307ms 23 Jul 2024 549th emgordon154 577 140 1,300ms 25 Nov 2024 550th Yewzir 🇧🇪 577 215 2,910ms 7 May 2024 551st msbranicky 576 193 17ms 10 Aug 2023 552nd MeWhenI 🇻🇦 575 207 17ms 1 Oct 2022 552nd DialFrost 🇸🇬 575 207 7ms 14 Jan 2024 554th MeWhenI 🇻🇦 575 291 45ms 30 Aug 2024 555th msbranicky 573 274 258ms 1 Oct 2023 556th Yewzir 🇧🇪 573 297 18ms 22 Dec 2024 557th MeWhenI 🇻🇦 573 307 56ms 23 Jun 2024 558th MeWhenI 🇻🇦 572 166 5ms 28 May 2023 559th martinnorling 🇸🇪 571 124 9ms 13 May 2022 560th SirBogman 🇺🇸 571 185 2ms 21 May 2022 First Prev 481–560 of 733 Next Last