The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 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 641st guilhem-roy 🇫🇷 415 259 2ms 9 May 2022 642nd prestosilver 🇺🇸 414 260 2ms 26 hours ago 643rd voytxt 🇨🇿 411 197 17ms 1 Mar 2023 644th 0dyse 405 200 17ms 13 Sep 2025 645th KatieLG 🇬🇧 405 313 11ms 17 Apr 2024 646th msbranicky 402 293 2,820ms 11 Jan 2025 647th blaztoma 🇱🇹 400 130 37ms 11 Oct 2025 648th scpchicken 🇵🇼 400 136 150ms 8 May 2022 649th MeWhenI 🇻🇦 397 256 4ms 6 Aug 2023 650th adamnielson42 🇺🇸 395 205 10ms 14 Apr 2023 651st aDwarfNamedUrist 395 266 2ms 30 Oct 2023 652nd alexeldridge 393 206 17ms 8 Aug 2024 652nd celiendonze 🇨🇭 393 206 12ms 21 Jan 2026 654th msbranicky 391 194 597ms 17 Jan 2024 655th eiburns 391 207 17ms 26 Oct 2023 656th yuchuehw 389 208 17ms 25 Feb 2024 657th shinh 385 135 35ms 25 Jun 2022 657th emgordon154 385 135 38ms 12 Sep 2024 659th adamnielson42 🇺🇸 385 215 11ms 26 Apr 2023 660th MeWhenI 🇻🇦 384 122 3ms 11 May 2022 661st msbranicky 378 207 233ms 20 Jan 2024 662nd Haksell 🇦🇶 374 139 34ms 23 Feb 2023 663rd Natanaelel 🇸🇪 370 147 141ms 13 Nov 2022 664th adoxography 369 141 38ms 2 Mar 2024 664th TheZwierzLF 🇵🇱 369 141 35ms 5 Jan 2026 666th dillon-duncando 368 220 11ms 3 Oct 2022 667th 4hg 🇺🇸 366 130 33ms 28 Jul 2023 668th HumanoidCPU 366 142 39ms 7 Aug 2024 669th madex 🇩🇪 366 294 2ms 8 May 2024 670th NoneTheFewer 365 222 11ms 25 Dec 2025 671st Babafaba 363 209 498ms 30 Oct 2025 672nd MeWhenI 🇻🇦 363 315 123ms 23 Jun 2024 673rd KatieLG 🇬🇧 362 194 9ms 23 Oct 2022 674th KatieLG 🇬🇧 362 365 378ms 1 Nov 2022 675th bakkeby 361 244 6ms 28 Sep 2022 676th KatieLG 🇬🇧 349 230 1,417ms 14 May 2022 677th MeWhenI 🇻🇦 328 379 143ms 8 May 2022 678th ravnskjaer 🇩🇰 321 442 458ms 15 Dec 2025 679th aksyristos 319 163 33ms 7 days ago 680th AtengChen 318 255 11ms 24 Aug 2024 681st chunes3 🇺🇸 317 348 71ms 14 Sep 2023 682nd KatieLG 🇬🇧 313 250 218ms 13 May 2022 683rd mathisfun271 313 259 11ms 4 Feb 2024 684th sidok 311 252 242ms 10 Aug 2024 685th ComputerKWasTaken 🇺🇸 310 261 17ms 9 Jun 2024 686th MeWhenI 🇻🇦 308 342 2ms 31 Dec 2022 687th MeWhenI 🇻🇦 306 599 893ms 28 Jul 2025 688th KatieLG 🇬🇧 305 387 276ms 1 Oct 2022 689th JOrE20 300 538 127ms 7 Dec 2025 690th yzhs 🇩🇪 298 263 315ms 31 May 2022 691st Bananapants22 298 272 11ms 8 Sep 2022 692nd Zhenyu-Bo 287 282 9ms 31 Jul 2025 693rd dylanjones92 279 290 12ms 26 Jan 2024 694th madex 🇩🇪 278 291 10ms 8 May 2024 695th MeWhenI 🇻🇦 275 198 157ms 25 May 2022 696th iczelia 🇩🇪 272 305 14ms 23 Oct 2025 697th gsprochette 265 306 18ms 21 Aug 2025 698th KatieLG 🇬🇧 261 483 744ms 2 Oct 2022 699th cros107 🇦🇺 260 311 11ms 9 Sep 2025 700th KatieLG-Transpiler 🇬🇧 245 539 387ms 2 Jul 2022 701st Msleizak 🇫🇷 241 314 264ms 28 Dec 2023 702nd KatieLG-Transpiler 🇬🇧 240 492 295ms 25 Sep 2022 703rd shibacho 🇯🇵 232 349 18ms 16 Nov 2022 704th KatieLG-Transpiler 🇬🇧 217 582 709ms 10 Jul 2022 705th KatieLG-Transpiler 🇬🇧 210 509 118ms 5 Nov 2022 706th 104210 209 388 11ms 26 Aug 2022 707th MeWhenI 🇻🇦 207 1,662 18ms 28 Jul 2025 708th Natanaelel 🇸🇪 203 235 33ms 17 Jul 2023 709th KatieLG 🇬🇧 202 529 119ms 6 Jan 2023 710th KatieLG-Transpiler 🇬🇧 197 412 10ms 23 Jun 2022 711th gifti258 195 565 72ms 15 Sep 2023 712th muser-logiccpu 🇺🇦 192 421 11ms 25 Jul 2025 713th KatieLG 🇬🇧 187 759 524ms 24 Jan 2023 714th KatieLG-Transpiler 🇬🇧 183 453 10ms 2 Nov 2022 715th arctouch-cristiannevianna 182 689 394ms 27 Jan 2023 716th KatieLG-Transpiler 🇬🇧 176 444 220ms 23 Jun 2022 717th KatieLG-Transpiler 🇬🇧 147 354 35ms 3 Jul 2022 718th lyphyser 143 752 2ms 18 Jul 2023 719th MeWhenI 🇻🇦 135 352 35ms 11 May 2022 720th KatieLG 🇬🇧 120 1,310 253ms 15 Sep 2024 First Prev 641–720 of 728 Next Last
