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 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 561st Jacob385 505 281 487ms 1 Feb 2025 562nd bizy-coder 503 151 503ms 27 Nov 2025 563rd rak1507 🇬🇧 503 161 17ms 8 Feb 2023 563rd StefanHabel 🇨🇦 503 161 17ms 26 Mar 2023 565th Shanethegamer 🇺🇸 502 349 68ms 20 May 2022 566th CLOStrophobic 🇮🇹 500 162 18ms 23 Jan 2025 566th andrewjc2000 500 162 17ms 18 Aug 2025 568th varhammer 500 288 6ms 13 Dec 2023 569th Shanethegamer 🇺🇸 495 133 3ms 12 May 2022 569th MeWhenI 🇻🇦 495 133 5ms 16 Apr 2023 571st HumanoidCPU 494 238 2,738ms 26 Oct 2024 572nd RYNO8 491 165 18ms 16 Aug 2022 572nd inverseLorentz 🇦🇺 491 165 11ms 24 Mar 2024 572nd edsrzf 🇳🇿 491 165 10ms 20 days ago 575th BREMAUCY 🇫🇷 488 166 17ms 30 May 2023 576th janbehrens 🇩🇪 487 130 10ms 3 Jul 2023 577th Shanethegamer 🇺🇸 487 216 2ms 20 May 2022 578th MeWhenI 🇻🇦 486 227 64ms 6 Nov 2023 579th RDShah 485 167 12ms 22 May 2022 580th jared-hughes 482 108 35ms 26 Dec 2023 581st aksyristos 482 168 18ms 25 Jan 2023 582nd jtaxen 479 169 18ms 1 Apr 2024 582nd Andrey2001 479 169 16ms 17 Dec 2025 584th MeWhenI 🇻🇦 478 148 156ms 25 Oct 2024 585th MeWhenI 🇻🇦 478 265 15ms 26 Aug 2023 586th commandz0 🇺🇸 477 159 467ms 1 Sep 2025 586th TheZwierzLF 🇵🇱 477 159 538ms 23 Nov 2025 588th IISResetMe 476 159 316ms 3 Jan 2026 589th Alex-x90 🇺🇸 476 170 18ms 15 Dec 2023 589th TheZwierzLF 🇵🇱 476 170 17ms 22 May 2025 591st stefangimmillaro 473 110 35ms 12 May 2025 592nd SniperSmiley 🇺🇸 471 172 18ms 29 Jun 2022 592nd adoxography 471 172 17ms 8 Aug 2022 594th MeWhenI 🇻🇦 471 301 1,454ms 25 May 2022 595th neihousaigaai 468 173 10ms 17 May 2022 596th acollett89 468 177 12ms 4 Aug 2025 597th dokutan 466 168 562ms 7 Apr 2024 598th KatieLG 🇬🇧 465 112 36ms 2 Oct 2025 599th Bonjour27891 🇻🇳 465 174 17ms 5 Jul 2022 600th croc54 463 175 18ms 8 Jan 2025 601st emgordon154 462 220 4ms 3 Jan 2025 602nd MichalMarsalek 🇨🇿 460 176 10ms 20 May 2022 603rd fgrosshans 🇫🇷 458 177 11ms 3 Nov 2022 604th GolfingSuccess 🇬🇷 458 241 71ms 19 Sep 2023 605th Natanaelel 🇸🇪 456 114 36ms 17 Jul 2023 606th MaxElf999 455 178 17ms 27 Sep 2022 606th za3k 455 178 11ms 14 Dec 2022 608th MeWhenI 🇻🇦 455 253 623ms 11 May 2022 609th BambooleanLogic 🇸🇪 453 183 12ms 15 Nov 2022 610th MeWhenI 🇻🇦 451 567 15ms 15 Nov 2023 611th Andrey2001 449 169 485ms 28 Jan 2026 612th JOrE20 448 391 27ms 30 Jan 2026 613th Eilonlif 🇮🇱 447 181 11ms 15 Feb 2024 613th Aquateraneal 🇺🇸 447 181 12ms 19 days ago 615th mbittner20 445 182 11ms 27 May 2023 615th rollershutter 445 182 11ms 4 Jul 2024 617th frankgraziano 443 143 12ms 7 Mar 2025 618th tomh1012 443 183 17ms 24 Feb 2026 619th sleepyStick 440 184 17ms 15 Jul 2022 620th jerrandolph 439 269 330ms 1 Oct 2025 621st SirFireball3521 438 185 19ms 6 Mar 2023 621st CutSandstone 438 185 17ms 4 Jul 2024 623rd nullie 435 186 18ms 8 Jun 2022 624th scpchicken 🇵🇼 433 187 17ms 4 Feb 2023 625th martinnorling 🇸🇪 431 188 17ms 10 May 2022 625th bac0id 431 188 17ms 5 Jul 2024 627th 0dyse 430 250 2ms 12 May 2025 628th AstroOrbis 428 189 17ms 12 Jul 2025 629th roguh 🇬🇹 428 246 2ms 18 Oct 2024 630th Lv0Sys 🇵🇱 427 122 35ms 7 Dec 2025 631st hiichbindermax 426 190 18ms 8 Feb 2023 632nd MeWhenI 🇻🇦 425 207 17ms 1 Oct 2022 633rd aksyristos 425 291 2,869ms 12 Mar 2023 634th jhpaques 🇫🇷 424 191 17ms 26 Jul 2022 634th hellwue 424 191 19ms 8 Feb 2023 636th madeforlosers 422 192 18ms 13 Nov 2025 637th 0dyse 422 293 74ms 12 May 2025 638th msbranicky 420 193 17ms 10 Aug 2023 639th pschmid0 🇺🇸 420 225 5ms 29 Sep 2022 640th JRaspass 🇬🇧 419 157 4ms 8 May 2022 First Prev 561–640 of 729 Next Last