The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 days. Why not try and solve them ahead of time?
12 Days of Christmas 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 160th elgan65536 🇺🇸 911 496 163ms 7 Feb 2026 162nd MeWhenI 🇻🇦 911 501 26ms 7 Jun 2023 163rd marshallward 🇺🇸 911 504 40ms 27 Dec 2024 164th MarcMush 🇫🇷 910 441 918ms 15 Nov 2023 164th alemelis 910 441 707ms 21 Feb 2024 164th lifthrasiir 🇰🇷 910 441 9ms 23 Nov 2024 167th Shanethegamer 🇺🇸 910 476 368ms 22 Apr 2023 168th detrumi 🇳🇱 909 497 168ms 12 Sep 2020 169th GrayJoKing 🇦🇺 909 502 28ms 4 Jan 2023 170th canissimia 🇦🇶 909 1,785 2ms 28 Dec 2021 171st lifthrasiir 🇰🇷 908 394 2ms 28 Nov 2024 172nd pardouin 🇫🇷 908 426 1,584ms 11 Jun 2025 173rd emgordon154 908 428 4ms 8 Sep 2025 174th MaxCastella 🇫🇷 908 429 269ms 31 Oct 2023 175th sean-niemann 🇺🇸 908 440 699ms 30 Jan 2026 176th mkitti 🇺🇸 908 442 676ms 22 Sep 2023 176th Steffan153 🇫🇮 908 442 13ms 19 Aug 2024 178th prplz 🇦🇺 907 419 34ms 2 Jul 2021 179th error256 907 506 1,422ms 16 Apr 2025 179th primo-ppcg 🇹🇭 907 506 41ms 24 May 2025 181st taylorzane 906 443 11ms 12 Aug 2022 181st biocommando 🇫🇮 906 443 10ms 26 Dec 2022 183rd rucin93 🇵🇱 906 470 2ms 19 Nov 2025 184th annaproxy 906 477 118ms 28 Mar 2022 185th Shanethegamer 🇺🇸 906 494 514ms 25 Sep 2025 186th prplz 🇦🇺 906 553 1,786ms 25 Apr 2024 187th MeWhenI 🇻🇦 905 457 114ms 26 Oct 2022 188th prplz 🇦🇺 905 499 216ms 20 Oct 2020 189th albanian-laundromat 904 442 735ms 14 Nov 2025 190th primo-ppcg 🇹🇭 904 479 113ms 9 Oct 2020 191st GrayJoKing 🇦🇺 904 486 20ms 19 Nov 2021 192nd primo-ppcg 🇹🇭 904 498 293ms 12 Oct 2020 193rd medric 902 445 12ms 4 Jul 2022 194th MeWhenI 🇻🇦 902 472 1ms 25 Dec 2023 195th AlephSquirrel 901 388 52ms 11 Feb 2023 196th edsrzf 🇳🇿 901 448 4ms 15 days ago 197th Alessandro-Balconi 🇮🇹 901 461 77ms 10 Aug 2023 198th GrayJoKing 🇦🇺 901 465 40ms 29 Jun 2022 199th chris-araman 901 481 104ms 3 Jan 2022 200th dokutan 901 497 458ms 30 Nov 2025 201st primo-ppcg 🇹🇭 901 650 14ms 13 Aug 2025 202nd Natanaelel 🇸🇪 900 422 33ms 11 Sep 2021 202nd olleicua 🇺🇸 900 422 34ms 26 Feb 2024 204th rgthree 900 446 9ms 9 Dec 2025 205th MeWhenI 🇻🇦 900 454 2ms 12 Sep 2022 206th laikoni 900 480 125ms 27 Dec 2018 207th stefangimmillaro 900 502 202ms 18 May 2025 208th primo-ppcg 🇹🇭 900 515 57ms 25 Jun 2022 209th typeswitch-dev 🇵🇹 900 517 3ms 22 Aug 2025 210th 2bular 899 398 2ms 9 Dec 2025 211th Shanethegamer 🇺🇸 899 449 4ms 26 Apr 2023 212th sean-niemann 🇺🇸 899 460 116ms 31 Oct 2024 213th AdrienHache 🇫🇷 899 462 412ms 8 Jan 2025 214th MeWhenI 🇻🇦 898 341 42ms 13 Feb 2025 215th MeWhenI 🇻🇦 898 389 49ms 15 Aug 2022 216th anter69 🇭🇺 898 423 34ms 20 Nov 2023 217th ofhouse 898 447 10ms 28 Apr 2020 217th thisishowmymindworks 🇳🇴 898 447 10ms 20 Oct 2020 217th neihousaigaai 898 447 10ms 25 Dec 2021 217th CallanMcNulty 898 447 12ms 19 Mar 2022 217th niklv 🇷🇺 898 447 10ms 28 Dec 2023 222nd HumanoidCPU 898 479 303ms 14 Mar 2024 222nd neel11235813 898 479 308ms 16 Mar 2024 222nd snoozingnewt 🇨🇦 898 479 303ms 30 Apr 2024 222nd dokutan 898 479 312ms 23 Sep 2024 226th arjanadriaanse 🇳🇱 898 481 127ms 26 Dec 2021 227th Alex-x90 🇺🇸 898 490 66ms 26 Jul 2023 228th SubsTheTechnomancer 898 503 211ms 3 Mar 2023 228th snoozingnewt 🇨🇦 898 503 224ms 23 Sep 2023 228th neel11235813 898 503 207ms 26 Mar 2024 228th sean-niemann 🇺🇸 898 503 202ms 6 Jun 2025 232nd GrayJoKing 🇦🇺 898 518 3ms 23 Jul 2023 233rd primo-ppcg 🇹🇭 897 395 17ms 6 Feb 2022 234th lifthrasiir 🇰🇷 897 432 484ms 2 Dec 2024 235th antimon2 🇯🇵 897 447 573ms 22 Feb 2022 236th MeWhenI 🇻🇦 897 463 83ms 13 Dec 2022 237th edsrzf 🇳🇿 897 476 128ms 1 Dec 2025 238th lynn 896 399 2ms 25 Jan 2022 239th hiddicop 🇸🇪 896 424 34ms 27 Jan 2021 239th sisyphus-ppcg 🇦🇺 896 424 36ms 4 Feb 2022 First Prev 161–240 of 4,083 Next Last
