The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 23 hours. Why not try and solve them ahead of time?
Arrows 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 881st CaedenHarper 🇨🇦 407 183 1,989ms 16 Oct 2025 882nd Mabeloid 🇳🇴 406 209 12ms 13 Oct 2024 883rd Stockoh 🇫🇷 406 235 14ms 1 May 2024 884th Shnapster 406 236 487ms 28 Sep 2023 885th wiebecommajonas 406 335 191ms 31 Oct 2021 886th blaztoma 🇱🇹 405 276 944ms 9 Nov 2025 887th JGDoerrer 405 336 196ms 14 Jan 2022 888th ridingqwerty 🇺🇸 404 207 676ms 22 Jan 2024 889th Yewzir 🇧🇪 404 210 13ms 17 Apr 2023 890th celiendonze 🇨🇭 404 236 14ms 21 Apr 2023 891st funnsam 🇭🇰 404 337 203ms 23 Oct 2023 892nd yzhs 🇩🇪 402 237 25ms 23 Jun 2023 892nd dranjohn 402 237 14ms 11 Sep 2023 894th Adix-null 🇱🇹 401 239 463ms 25 Feb 2023 894th amazingalek 🇳🇴 401 239 492ms 1 Jan 2026 896th BBoehm 🇩🇪 400 212 11ms 30 Jan 2024 897th estomagordo 🇳🇱 399 239 14ms 16 Nov 2022 897th Trusly 399 239 13ms 24 Feb 2024 897th jameswmccarty 399 239 12ms 29 Sep 2024 897th ImpressedByRocks 399 239 22ms 24 Feb 2025 901st Apataras 399 282 679ms 29 Jul 2025 902nd JRaspass 🇬🇧 398 321 353ms 23 Sep 2022 903rd adriweb 🇫🇷 397 236 3ms 9 Aug 2023 904th amadeusdotpng 397 240 15ms 15 Jun 2023 904th raspofabs 397 240 20ms 10 Jul 2023 906th madex 🇩🇪 397 269 390ms 16 days ago 907th Florian-Mt 396 214 12ms 9 Jul 2024 908th OrangeBacon 396 241 13ms 1 Aug 2024 909th aresok 396 284 659ms 2 Jul 2023 910th evnu 396 327 126ms 11 Jun 2023 911th Wildst 394 242 14ms 20 Jul 2022 911th ellis-rix 394 242 13ms 12 Jun 2023 913th madex 🇩🇪 393 243 13ms 26 May 2024 913th Bodo171 393 243 11ms 1 Jul 2024 915th ChrisTheisen 393 244 486ms 14 Dec 2022 916th Herbert00709 🇵🇱 391 280 75ms 24 Nov 2024 917th panekj 🇵🇱 391 327 342ms 3 May 2022 917th harshit54 391 327 387ms 6 Jan 2024 919th CatsAreFluffy 389 215 798ms 15 Jan 2024 919th Andrey2001 389 215 616ms 26 Nov 2025 921st MisterrLuck 388 351 188ms 28 Oct 2024 922nd mr-luna 387 291 750ms 5 May 2022 923rd Yewzir 🇧🇪 386 269 10ms 18 Dec 2024 924th connorslade 386 353 186ms 13 May 2022 925th msbranicky 385 221 2ms 10 Oct 2023 926th CaedenHarper 🇨🇦 385 249 459ms 16 Oct 2025 927th crizin 🇰🇷 385 292 661ms 15 Sep 2023 928th Aurel300 🇨🇭 385 354 190ms 30 Jun 2024 929th KatieLG 🇬🇧 384 198 2,279ms 2 Sep 2021 930th MattShaile 384 221 12ms 26 Apr 2022 931st ibeucaly 384 333 355ms 6 Oct 2022 932nd AshyIsMe 🇦🇺 383 161 46ms 27 Jul 2022 933rd P-Quentin 🇫🇷 383 249 14ms 3 Aug 2022 934th panekj 🇵🇱 383 355 195ms 3 May 2022 935th KingSkyrock 🇺🇸 382 222 14ms 16 Feb 2022 935th JTH1999 382 222 13ms 11 Apr 2023 937th mrmena 🇦🇺 382 250 14ms 3 Sep 2021 938th blaztoma 🇱🇹 381 340 121ms 9 Nov 2025 939th HumanoidCPU 380 222 179ms 23 Nov 2025 940th johanrosenson 380 223 13ms 8 Dec 2021 941st realicraft 380 251 12ms 21 Mar 2022 941st TheZappie 380 251 13ms 9 Apr 2022 941st hellwue 380 251 13ms 22 Nov 2023 941st robbertvz 380 251 11ms 19 Nov 2025 945th LukeBridges 🇬🇧 379 224 13ms 11 Apr 2024 946th camieac 🇬🇧 379 252 14ms 12 Jul 2023 947th Eolu 379 359 196ms 17 Jan 2022 948th juliansiebert 🇩🇪 378 180 296ms 6 Dec 2023 949th Yewzir 🇧🇪 378 225 2ms 19 Nov 2025 950th prestosilver 🇺🇸 378 228 2ms 15 Dec 2025 951st dokutan 377 202 2,093ms 21 Sep 2025 952nd Re-Adventures 🇮🇳 377 225 14ms 17 Dec 2023 953rd aglahir1 377 253 11ms 23 Feb 2022 953rd diquah 377 253 18ms 1 Nov 2023 955th pandapawskat 376 229 2ms 25 Aug 2021 956th jhpaques 🇫🇷 376 254 14ms 27 Jul 2022 957th premun 🇨🇿 376 255 497ms 19 Nov 2022 958th Giga-Bowser 374 227 13ms 6 Jan 2022 959th hymanimy 374 255 14ms 26 Aug 2021 960th nikolay 🇺🇸 374 342 399ms 5 Jan 2022 First Prev 881–960 of 1,320 Next Last