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 1st hellopir2 1,000 190 2,167ms 10 hours ago 2nd rucin93 🇵🇱 977 411 10ms 10 Oct 2020 2nd Argeento 🇵🇱 977 411 10ms 10 Oct 2020 2nd sean-niemann 🇺🇸 977 411 9ms 18 Jul 2024 5th Lydxn 🇨🇦 966 431 2ms 5 Jul 2022 6th bitsandbeyond 🇳🇱 965 404 358ms 18 Feb 2026 7th JayXon 🇺🇸 964 431 482ms 12 Dec 2022 8th NewDefectus 🇮🇱 964 432 2ms 10 Feb 2021 9th JayXon 🇺🇸 963 417 14ms 25 Apr 2023 10th JayXon 🇺🇸 962 395 35ms 17 May 2022 11th BlankSpruce 959 459 94ms 28 Mar 2025 12th JayXon 🇺🇸 959 467 371ms 26 Sep 2025 13th kg583 🇺🇸 958 321 6ms 8 Dec 2024 13th edsrzf 🇳🇿 958 321 6ms 19 Feb 2025 13th CLOStrophobic 🇮🇹 958 321 6ms 19 Feb 2025 16th emplv 🇱🇻 956 414 5ms 24 Aug 2023 17th saito-ta 🇯🇵 954 355 5ms 23 Dec 2022 18th JayXon 🇺🇸 953 474 202ms 22 May 2025 18th acotis 953 474 306ms 18 Dec 2025 20th o0lit3 🇺🇸 952 323 5ms 16 Apr 2021 20th primo-ppcg 🇹🇭 952 323 6ms 16 Apr 2021 22nd nwellnhof 🇩🇪 952 365 155ms 25 Dec 2020 23rd primo-ppcg 🇹🇭 951 356 5ms 24 Mar 2021 23rd o0lit3 🇺🇸 951 356 4ms 24 Mar 2021 25th emplv 🇱🇻 951 422 10ms 24 Aug 2023 26th primo-ppcg 🇹🇭 950 410 260ms 9 Nov 2021 27th GrayJoKing 🇦🇺 949 449 1ms 11 Feb 2022 28th primo-ppcg 🇹🇭 948 401 35ms 10 Dec 2021 29th BlankSpruce 948 439 1ms 1 Apr 2025 30th MeWhenI 🇻🇦 948 472 453ms 7 Nov 2025 31st JayXon 🇺🇸 948 475 286ms 16 May 2022 32nd saito-ta 🇯🇵 947 376 4ms 17 May 2023 33rd MeWhenI 🇻🇦 946 325 6ms 15 Oct 2021 33rd lynn 946 325 5ms 25 Jan 2022 33rd neel11235813 946 325 6ms 10 Oct 2023 33rd AlephSquirrel 946 325 6ms 4 Oct 2024 37th JayXon 🇺🇸 946 465 519ms 16 May 2022 38th primo-ppcg 🇹🇭 945 425 10ms 5 Oct 2020 39th prplz 🇦🇺 944 413 251ms 5 Oct 2020 40th edsrzf 🇳🇿 943 339 13ms 19 Feb 2025 40th kg583 🇺🇸 943 339 13ms 18 days ago 42nd JayXon 🇺🇸 943 411 421ms 5 Feb 2026 43rd xnor-gate 943 458 135ms 16 Jan 2025 44th ovs-code 🇩🇪 942 371 44ms 29 Nov 2024 45th duckyluuk 🇳🇱 942 426 19ms 18 Jul 2025 46th sean-niemann 🇺🇸 942 460 115ms 27 Dec 2024 47th btnlq 941 414 316ms 15 Mar 2021 48th GrayJoKing 🇦🇺 940 327 5ms 15 Feb 2023 48th blaztoma 🇱🇹 940 327 7ms 77 mins ago 50th lyphyser 940 358 59ms 15 Feb 2024 51st vlpx 🇫🇮 940 427 10ms 1 Aug 2024 52nd sean-niemann 🇺🇸 940 476 489ms 26 Sep 2025 53rd primo-ppcg 🇹🇭 939 372 37ms 2 Oct 2022 54th JayXon 🇺🇸 939 427 2,249ms 21 Jun 2021 55th Lydxn 🇨🇦 938 413 531ms 16 Jan 2024 56th JayXon 🇺🇸 938 444 2ms 9 Dec 2025 57th HPWiz 🇳🇿 937 378 1,027ms 21 Jun 2022 58th JayXon 🇺🇸 937 461 126ms 28 May 2022 59th ovs-code 🇩🇪 936 382 3ms 28 Nov 2024 60th error256 936 404 73ms 3 Jul 2024 61st gonrial 936 429 10ms 16 Dec 2020 62nd JayXon 🇺🇸 935 414 1,296ms 10 Dec 2021 63rd primo-ppcg 🇹🇭 934 372 273ms 14 Oct 2020 64th kg583 🇺🇸 933 328 38ms 13 Feb 2025 64th edsrzf 🇳🇿 933 328 41ms 19 Feb 2025 66th primo-ppcg 🇹🇭 933 461 354ms 1 Aug 2023 67th kumavale 933 484 185ms 18 Jan 2026 68th ovs-code 🇩🇪 931 403 32ms 6 Feb 2024 69th dmrichwa 🇺🇸 931 431 9ms 19 Aug 2024 70th MeWhenI 🇻🇦 929 409 36ms 3 Aug 2022 71st MichalMarsalek 🇨🇿 929 463 304ms 7 Mar 2023 72nd lynn 929 486 263ms 28 Mar 2022 73rd primo-ppcg 🇹🇭 928 417 1,344ms 10 Dec 2021 74th Mukundan314 928 467 213ms 9 Jul 2025 75th edsrzf 🇳🇿 927 409 3ms 13 Nov 2025 76th veiko 927 433 9ms 18 Jun 2022 76th MeWhenI 🇻🇦 927 433 10ms 19 Aug 2024 78th ovs-code 🇩🇪 927 448 80ms 22 Apr 2024 79th primo-ppcg 🇹🇭 926 419 1ms 19 Nov 2022 80th MeWhenI 🇻🇦 926 421 266ms 28 Jan 2023 1–80 of 4,083 Next Last