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?
Spelling Numbers 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 801st FusionAtom360 275 405 19ms 4 Jan 2026 802nd aalec 275 406 21ms 22 Nov 2025 803rd dokutan 275 518 134ms 1 Dec 2025 804th argusdusty 🇺🇸 274 407 19ms 1 Jan 2021 805th CaedenHarper 🇨🇦 273 385 505ms 6 Feb 2026 806th emgordon154 273 409 20ms 21 Sep 2025 807th c0d3-4-F00d 🇩🇪 273 792 5ms 4 Dec 2021 808th johnennewdeeson 273 1,002 6ms 13 Oct 2017 809th EnTerr 271 412 20ms 8 Sep 2024 809th JOrE20 271 412 14ms 25 Dec 2025 811th beabro 270 1,098 240ms 5 Dec 2024 812th jotslo 🇬🇧 269 415 14ms 12 Jul 2021 813th cbrt-x 269 886 464ms 16 Oct 2023 814th richard-oelze 🇩🇪 268 416 20ms 19 Apr 2021 815th dokutan 268 500 537ms 3 Dec 2025 816th dokutan 268 1,026 121ms 1 Dec 2025 817th Europe2048 266 419 13ms 2 Dec 2024 818th dokutan 266 436 38ms 1 Dec 2025 819th jetzerv 266 896 437ms 17 Dec 2020 820th inverseLorentz 🇦🇺 265 421 15ms 22 Aug 2022 821st labster 264 360 4ms 10 May 2018 822nd rustykitty 🇺🇸 264 422 19ms 19 days ago 823rd AdamMorris377 263 423 20ms 29 Sep 2024 824th HCRitter 🇩🇪 263 511 361ms 1 Nov 2023 825th dokutan 262 523 593ms 7 Apr 2024 826th eiburns 260 428 20ms 23 Oct 2023 826th ImpressedByRocks 260 428 14ms 26 Jul 2024 828th TheAristos 260 429 14ms 30 Oct 2019 829th alangodfrey 259 430 14ms 18 Feb 2019 830th OddballGreg 258 449 41ms 26 Sep 2020 831st msrawson 257 433 14ms 28 Aug 2018 832nd croc54 257 434 14ms 16 Jan 2025 833rd nephila-nacrea 🇬🇧 255 373 7ms 17 Jan 2018 834th amollberg 🇸🇪 255 437 21ms 22 Jan 2022 834th za3k 255 437 14ms 12 Oct 2022 836th GameChaos 254 439 19ms 8 Dec 2020 836th BREMAUCY 🇫🇷 254 439 20ms 15 Nov 2024 838th petroselo 253 440 22ms 29 Dec 2021 839th nstearns96 🇬🇧 253 441 14ms 25 Oct 2024 840th cellobix 252 442 21ms 15 Aug 2019 840th geofft 252 442 13ms 11 Dec 2020 842nd vroup 🇩🇰 252 660 11ms 19 Sep 2022 843rd timchu 246 453 14ms 4 Mar 2021 843rd twocatsinatrenchcoat 246 453 14ms 18 Nov 2022 843rd AstroOrbis 246 453 13ms 12 Jul 2025 846th yokasuretsu 245 454 15ms 30 Nov 2021 846th madex 🇩🇪 245 454 20ms 9 Jul 2024 848th rowboat1 245 455 15ms 11 Apr 2020 849th ceeb9 244 457 14ms 8 Jun 2023 850th damoose717 243 458 13ms 25 May 2025 850th zgialor-lab 243 458 19ms 15 days ago 852nd northvandrew 243 553 342ms 24 Sep 2021 853rd Omega65536 🇩🇪 241 463 15ms 10 Aug 2025 854th buddyw 240 464 22ms 9 Mar 2023 855th dillon-duncando 239 467 13ms 4 Oct 2022 856th hellwue 238 468 13ms 2 Sep 2024 857th stephanie-flower 238 700 13ms 23 Nov 2025 858th MeWhenI 🇻🇦 238 1,678 71ms 9 Jul 2021 859th E2dgar 237 702 13ms 31 Jan 2022 860th Florian-Mt 236 473 19ms 12 Jul 2024 860th Andrey2001 236 473 13ms 1 Feb 2026 862nd andre-lameirinhas 🇵🇹 235 474 13ms 27 Apr 2020 863rd NanduBC 234 477 21ms 18 Apr 2021 864th rvdnieuwendijk 🇳🇱 234 573 283ms 30 Jul 2020 865th dokutan 234 926 2ms 23 Feb 2026 866th KatieLG 🇬🇧 232 409 4ms 12 May 2021 867th trist224 🇫🇷 232 480 14ms 16 Nov 2022 867th yuchuehw 232 480 14ms 1 Jan 2024 869th Jaydosu 231 483 24ms 26 Oct 2021 870th TheZwierzLF 🇵🇱 231 503 41ms 21 Dec 2025 871st cnelson20 231 1,030 491ms 11 Oct 2022 872nd luftj 230 484 13ms 3 May 2020 873rd myleopard 230 485 14ms 13 Oct 2021 874th MeWhenI 🇻🇦 230 1,472 59ms 13 Jun 2022 875th jfallon1997 228 488 14ms 5 Jan 2023 875th Chara-0x 228 488 12ms 18 Sep 2025 877th vonKrafft 228 489 14ms 27 Mar 2020 877th sciencedjinn 228 489 13ms 8 Nov 2024 879th MeWhenI 🇻🇦 228 1,522 25ms 27 Jul 2021 880th MeWhenI 🇻🇦 228 1,566 335ms 12 May 2021 First Prev 801–880 of 1,080 Next Last
