The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?
Zodiac Signs 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 321st helbling 🇨🇭 644 153 10ms 8 Oct 2024 322nd Shanethegamer 🇺🇸 643 131 3ms 8 Nov 2022 323rd emgordon154 643 186 3ms 6 Feb 2026 324th albanian-laundromat 643 195 5ms 20 Feb 2026 325th inventshah 641 229 51ms 22 Sep 2022 326th MeWhenI 🇻🇦 640 316 1,678ms 7 Nov 2025 327th Shanethegamer 🇺🇸 639 113 35ms 26 Feb 2023 328th nwellnhof 🇩🇪 636 142 12ms 12 Jun 2022 329th stefangimmillaro 636 155 11ms 26 Sep 2024 330th MeWhenI 🇻🇦 636 226 43ms 29 Apr 2025 331st primo-ppcg 🇹🇭 635 82 5ms 10 Jun 2022 332nd MeWhenI 🇻🇦 635 103 8ms 14 Jun 2022 333rd Natanaelel 🇸🇪 633 114 36ms 11 Jun 2022 334th Shanethegamer 🇺🇸 631 172 7ms 6 Aug 2023 335th GrayJoKing 🇦🇺 630 90 162ms 11 Jun 2022 336th MeWhenI 🇻🇦 630 199 4ms 21 Jul 2023 337th niklv 🇷🇺 628 157 13ms 29 Jul 2022 338th neel11235813 626 133 439ms 16 Mar 2024 339th lynn 623 145 12ms 25 Mar 2023 340th SirBogman 🇺🇸 622 116 35ms 10 Jun 2022 341st annaproxy 621 221 440ms 10 Jun 2022 342nd ryyyn 🇺🇸 619 146 19ms 3 Oct 2025 343rd Shanethegamer 🇺🇸 616 135 582ms 26 Mar 2024 344th Yax42 🇫🇷 616 160 11ms 20 Jan 2026 345th CaedenHarper 🇨🇦 616 270 413ms 5 days ago 346th AlephSquirrel 615 147 12ms 3 Jan 2023 346th 5cw 🇺🇸 615 147 13ms 11 May 2025 346th Seek64 🇩🇪 615 147 12ms 24 Jan 2026 346th blaztoma 🇱🇹 615 147 13ms 26 hours ago 350th elgan65536 🇺🇸 615 298 228ms 9 Apr 2024 351st stefangimmillaro 614 207 9ms 4 Sep 2023 352nd edsrzf 🇳🇿 614 233 41ms 14 Feb 2025 353rd Lv0Sys 🇵🇱 612 118 42ms 26 Feb 2026 354th bricknellj 610 148 12ms 2 Dec 2022 354th bizy-coder 610 148 20ms 23 Nov 2023 354th MeWhenI 🇻🇦 610 148 12ms 7 Dec 2023 354th Lv0Sys 🇵🇱 610 148 19ms 26 Feb 2026 358th olleicua 🇺🇸 607 119 39ms 7 Nov 2025 359th lynn 607 137 458ms 17 Feb 2024 360th TFeld00 🇩🇰 606 149 11ms 30 Jun 2022 360th FlorianCassayre 🇫🇷 606 149 12ms 23 Nov 2022 362nd jared-hughes 606 182 7ms 28 Jul 2022 363rd MeWhenI 🇻🇦 605 225 442ms 12 Jun 2022 364th emgordon154 603 281 4ms 12 Nov 2025 365th itsh01 601 164 13ms 12 Jun 2022 366th edsrzf 🇳🇿 600 242 13ms 11 Dec 2025 367th AlephSquirrel 599 139 540ms 21 Jan 2024 367th m-tkach 🇺🇦 599 139 504ms 19 Mar 2024 369th nwellnhof 🇩🇪 598 87 7ms 11 Jun 2022 370th MeWhenI 🇻🇦 598 137 289ms 29 Jan 2023 371st Alex-x90 🇺🇸 598 151 12ms 31 May 2024 371st Babafaba 598 151 13ms 4 Nov 2025 373rd maxpelic 🇺🇸 597 165 12ms 5 Jul 2022 374th bizy-coder 594 140 485ms 16 Jan 2024 374th MeWhenI 🇻🇦 594 140 464ms 24 May 2024 376th NewDefectus 🇮🇱 594 152 11ms 10 Jun 2022 376th prplz 🇦🇺 594 152 12ms 27 Dec 2023 378th MeWhenI 🇻🇦 594 524 15ms 1 Aug 2023 379th stefangimmillaro 587 154 19ms 27 Sep 2024 379th Mabeloid 🇳🇴 587 154 12ms 6 Oct 2024 379th InigoK 🇺🇸 587 154 12ms 10 Oct 2025 382nd edsrzf 🇳🇿 587 185 6ms 21 Jun 2025 383rd CaedenHarper 🇨🇦 587 289 116ms 7 Nov 2025 384th SirBogman 🇺🇸 586 142 447ms 16 Jan 2024 385th AlephSquirrel 585 248 15ms 24 Oct 2024 386th shelerr 583 155 18ms 22 Aug 2025 387th AlephSquirrel 582 67 75ms 11 Feb 2023 387th Steffan153 🇫🇮 582 67 89ms 19 Mar 2023 389th inventshah 579 156 31ms 9 Jun 2022 389th annaproxy 579 156 18ms 15 Aug 2022 391st snoozingnewt 🇨🇦 579 293 152ms 8 Nov 2025 392nd MeWhenI 🇻🇦 578 251 10ms 25 Nov 2023 393rd jared-hughes 576 157 11ms 10 Jun 2022 394th blaztoma 🇱🇹 573 126 36ms 8 Jan 2026 395th Salutations45 573 172 10ms 16 Nov 2024 396th davecame 572 158 12ms 5 Dec 2023 396th Bulmenisaurus 572 158 19ms 29 Jul 2024 398th dokutan 572 187 14ms 3 Jul 2024 399th Mabeloid 🇳🇴 572 209 2ms 6 Oct 2024 400th janbehrens 🇩🇪 572 240 410ms 24 Apr 2023 First Prev 321–400 of 665 Next Last