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 641st Natanaelel 🇸🇪 492 147 141ms 13 Nov 2022 642nd janbehrens 🇩🇪 491 130 10ms 3 Jul 2023 643rd JOrE20 489 170 17ms 5 Feb 2026 644th Shanethegamer 🇺🇸 489 216 2ms 20 May 2022 645th MeWhenI 🇻🇦 488 227 64ms 6 Nov 2023 646th bakkeby 488 244 6ms 28 Sep 2022 647th MeWhenI 🇻🇦 483 315 123ms 23 Jun 2024 648th MeWhenI 🇻🇦 482 256 4ms 6 Aug 2023 649th cingulataluke 481 231 11ms 27 Aug 2023 650th MeWhenI 🇻🇦 481 265 15ms 26 Aug 2023 651st MeWhenI 🇻🇦 474 301 1,454ms 25 May 2022 652nd Babafaba 471 209 498ms 30 Oct 2025 653rd acollett89 470 177 10ms 4 Aug 2025 654th aksyristos 462 163 33ms 6 days ago 655th GolfingSuccess 🇬🇷 460 241 71ms 19 Sep 2023 656th MeWhenI 🇻🇦 457 253 623ms 11 May 2022 657th BambooleanLogic 🇸🇪 454 183 10ms 15 Nov 2022 658th dokutan 452 191 295ms 15 Feb 2024 659th MeWhenI 🇻🇦 452 567 15ms 15 Nov 2023 660th JOrE20 450 391 27ms 30 Jan 2026 661st frankgraziano 447 143 12ms 7 Mar 2025 662nd KatieLG 🇬🇧 446 169 36ms 18 Aug 2025 663rd jerrandolph 440 269 330ms 1 Oct 2025 664th AtengChen 436 255 11ms 24 Aug 2024 665th 0dyse 435 250 2ms 12 May 2025 666th roguh 🇬🇹 429 246 2ms 18 Oct 2024 667th mathisfun271 429 259 11ms 4 Feb 2024 668th ComputerKWasTaken 🇺🇸 426 261 17ms 9 Jun 2024 669th aksyristos 426 291 2,938ms 12 Mar 2023 670th 0dyse 423 293 71ms 12 May 2025 671st JRaspass 🇬🇧 422 157 4ms 8 May 2022 672nd pschmid0 🇺🇸 422 225 5ms 29 Sep 2022 673rd guilhem-roy 🇫🇷 420 259 2ms 9 May 2022 674th prestosilver 🇺🇸 418 260 2ms 39 mins ago 675th msbranicky 417 207 233ms 20 Jan 2024 676th Bananapants22 408 272 11ms 8 Sep 2022 677th KatieLG 🇬🇧 407 313 11ms 17 Apr 2024 678th msbranicky 403 293 2,820ms 11 Jan 2025 679th aDwarfNamedUrist 397 266 2ms 30 Oct 2023 680th Zhenyu-Bo 394 282 9ms 31 Jul 2025 681st MeWhenI 🇻🇦 389 122 3ms 11 May 2022 682nd adamnielson42 🇺🇸 387 215 10ms 26 Apr 2023 683rd dylanjones92 383 290 12ms 26 Jan 2024 684th madex 🇩🇪 382 291 10ms 8 May 2024 685th 4hg 🇺🇸 370 130 33ms 28 Jul 2023 686th madex 🇩🇪 370 294 2ms 8 May 2024 687th KatieLG 🇬🇧 365 194 9ms 23 Oct 2022 688th MeWhenI 🇻🇦 365 198 157ms 25 May 2022 689th gsprochette 363 306 18ms 21 Aug 2025 690th KatieLG 🇬🇧 363 365 378ms 1 Nov 2022 691st cros107 🇦🇺 357 311 11ms 9 Sep 2025 692nd KatieLG 🇬🇧 351 230 1,417ms 14 May 2022 693rd KatieLG 🇬🇧 344 251 218ms 13 May 2022 694th sidok 342 253 242ms 10 Aug 2024 695th yzhs 🇩🇪 329 263 315ms 31 May 2022 696th MeWhenI 🇻🇦 329 379 143ms 8 May 2022 697th ravnskjaer 🇩🇰 322 442 458ms 15 Dec 2025 698th chunes3 🇺🇸 318 348 71ms 14 Sep 2023 699th shibacho 🇯🇵 318 349 18ms 16 Nov 2022 700th MeWhenI 🇻🇦 309 342 2ms 31 Dec 2022 701st MeWhenI 🇻🇦 307 599 893ms 28 Jul 2025 702nd KatieLG 🇬🇧 306 387 276ms 1 Oct 2022 703rd JOrE20 302 538 127ms 7 Dec 2025 704th 104210 286 388 11ms 26 Aug 2022 705th iczelia 🇩🇪 273 305 10ms 23 Oct 2025 706th KatieLG-Transpiler 🇬🇧 270 412 10ms 23 Jun 2022 707th muser-logiccpu 🇺🇦 264 421 11ms 25 Jul 2025 708th KatieLG 🇬🇧 262 483 744ms 2 Oct 2022 709th Msleizak 🇫🇷 258 314 264ms 28 Dec 2023 710th KatieLG-Transpiler 🇬🇧 246 539 387ms 2 Jul 2022 711th KatieLG-Transpiler 🇬🇧 241 492 295ms 25 Sep 2022 712th KatieLG-Transpiler 🇬🇧 218 582 709ms 10 Jul 2022 713th KatieLG-Transpiler 🇬🇧 213 354 35ms 3 Jul 2022 714th KatieLG-Transpiler 🇬🇧 211 509 118ms 5 Nov 2022 715th MeWhenI 🇻🇦 207 1,662 18ms 28 Jul 2025 716th Natanaelel 🇸🇪 205 235 33ms 17 Jul 2023 717th KatieLG 🇬🇧 203 529 119ms 6 Jan 2023 718th gifti258 196 565 72ms 15 Sep 2023 719th KatieLG-Transpiler 🇬🇧 194 445 220ms 23 Jun 2022 720th KatieLG 🇬🇧 187 759 524ms 24 Jan 2023 First Prev 641–720 of 733 Next Last
