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 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 481st BREMAUCY 🇫🇷 700 270 10ms 7 Mar 2024 481st Jacob385 700 270 10ms 4 Apr 2024 481st rucin93 🇵🇱 700 270 10ms 31 May 2025 484th acotis 700 474 306ms 18 Dec 2025 485th LucaArgentiUCF 🇮🇹 700 649 39ms 14 Feb 2021 486th MeWhenI 🇻🇦 699 318 3ms 1 Nov 2023 487th P-Quentin 🇫🇷 698 271 10ms 3 Aug 2022 487th fkantelberg 698 271 11ms 15 Jul 2025 489th MeWhenI 🇻🇦 696 834 11ms 28 Aug 2023 490th schachmattmatt 695 272 11ms 11 Aug 2021 491st dokutan 695 324 2ms 18 Apr 2025 492nd SephQ 694 266 35ms 7 Feb 2021 493rd pardouin 🇫🇷 693 283 1,461ms 15 Aug 2025 494th dokutan 693 304 77ms 28 Mar 2025 495th kumavale 693 479 179ms 18 Jan 2026 496th ZakkkkAttackkkk 🇵🇭 692 273 31ms 25 Dec 2021 496th Starwort 🇬🇧 692 273 10ms 4 Dec 2022 498th xnor-gate 691 458 135ms 16 Jan 2025 499th bstrautin 690 268 261ms 16 Jun 2020 500th vezzick 690 274 10ms 8 Mar 2021 500th GeneralTwi 690 274 10ms 4 May 2022 502nd HumanoidCPU 689 269 426ms 9 May 2024 503rd noah-dean-wa 689 556 1ms 15 Feb 2024 504th galloj 🇨🇿 689 572 2ms 5 Sep 2022 505th MichalMarsalek 🇨🇿 687 275 10ms 18 Feb 2023 505th cuboids 687 275 10ms 16 Jul 2024 505th Deedogg 687 275 10ms 30 Oct 2025 508th lynn 687 509 1,021ms 23 Jul 2021 509th Jacob385 686 270 355ms 4 Apr 2024 510th dokutan 686 357 3ms 27 Apr 2025 511th bthalheim 685 276 10ms 1 Aug 2022 512th namelessiw 684 358 494ms 26 Oct 2024 513th lynn 683 486 263ms 28 Mar 2022 514th Jaykul 682 271 269ms 29 Apr 2024 515th Re-Adventures 🇮🇳 682 277 9ms 30 Sep 2020 516th Yewzir 🇧🇪 682 388 454ms 19 Nov 2023 517th Sp3000 🇦🇺 682 467 5ms 29 May 2021 518th cyrilboyer 🇫🇷 681 316 11ms 6 Jan 2024 519th leon-w 680 278 10ms 4 Jan 2019 520th mau-mauricelim 680 449 2ms 22 Jul 2023 521st primo-ppcg 🇹🇭 680 515 57ms 25 Jun 2022 522nd DaCuteRaccoon 680 518 2ms 5 Apr 2022 523rd forthuser 680 676 3ms 25 Jul 2023 524th soren 678 520 2ms 23 Aug 2018 525th HPWiz 🇳🇿 677 468 116ms 3 Sep 2021 526th prplz 🇦🇺 676 518 58ms 13 Jul 2021 527th MeWhenI 🇻🇦 675 546 7ms 23 Nov 2023 528th lynn 674 465 1,304ms 30 Nov 2021 528th primo-ppcg 🇹🇭 674 465 1,325ms 30 Nov 2021 530th ovs-code 🇩🇪 674 470 126ms 22 Sep 2024 531st rak1507 🇬🇧 672 454 2ms 31 Jan 2022 531st Shanethegamer 🇺🇸 672 454 2ms 27 May 2024 533rd sean-niemann 🇺🇸 671 472 119ms 1 Jul 2022 533rd Steffan153 🇫🇮 671 472 121ms 19 Aug 2024 535th sean-niemann 🇺🇸 670 230 39ms 5 Jul 2025 536th dokutan 669 394 2ms 1 Dec 2025 537th elgan65536 🇺🇸 669 496 163ms 7 Feb 2026 538th detrumi 🇳🇱 668 497 168ms 12 Sep 2020 539th Shanethegamer 🇺🇸 667 470 1,311ms 16 Mar 2023 540th kimbo 🇺🇸 666 284 17ms 3 Dec 2022 541st non-bin 664 324 11ms 27 Jun 2025 542nd annaproxy 664 477 118ms 28 Mar 2022 543rd VilBoub 663 285 10ms 17 Apr 2022 543rd RJFuller 663 285 11ms 8 Mar 2024 545th MeWhenI 🇻🇦 663 473 1,268ms 8 Jun 2023 546th dpethes 663 528 57ms 10 Jan 2024 547th MeWhenI 🇻🇦 663 693 4ms 14 Jul 2023 548th itsh01 662 325 10ms 26 Dec 2021 548th dylanarmstrong 662 325 15ms 3 Jan 2024 550th GrayJoKing 🇦🇺 662 2,445 2ms 16 Oct 2020 551st stefangimmillaro 661 502 202ms 18 May 2025 552nd byronknoll 🇺🇸 660 401 451ms 22 Jan 2024 553rd laikoni 660 480 125ms 27 Dec 2018 554th SubsTheTechnomancer 660 503 211ms 3 Mar 2023 554th snoozingnewt 🇨🇦 660 503 224ms 23 Sep 2023 554th neel11235813 660 503 207ms 26 Mar 2024 554th sean-niemann 🇺🇸 660 503 202ms 6 Jun 2025 558th stefangimmillaro 658 298 1,268ms 18 Oct 2023 559th arjanadriaanse 🇳🇱 658 481 127ms 26 Dec 2021 560th Skepfyr 657 505 156ms 4 Jan 2020 First Prev 481–560 of 4,056 Next Last
