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?
Day of Week 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 109th kirjavascript 949 71 59ms 13 Feb 2025 109th MeWhenI 🇻🇦 949 71 51ms 13 Mar 2025 109th fuzzylojik-golf 🇺🇸 949 71 57ms 29 May 2025 109th JOrE20 949 71 53ms 15 Nov 2025 109th snoozingnewt 🇨🇦 949 71 54ms 7 Dec 2025 109th CornerMercury 🇬🇧 949 71 55ms 7 Dec 2025 109th Lv0Sys 🇵🇱 949 71 53ms 8 Dec 2025 109th DialFrost 🇸🇬 949 71 51ms 14 Dec 2025 109th iamsterdam800 949 71 51ms 1 Feb 2026 109th Natanaelel 🇸🇪 949 71 50ms 2 days ago 109th smclaughlin-cf 949 71 48ms 32 hours ago 172nd Steffan153 🇫🇮 943 40 34ms 25 Dec 2023 172nd janlelis 943 40 37ms 25 Dec 2023 172nd JayXon 🇺🇸 943 40 37ms 25 Dec 2023 172nd ovs-code 🇩🇪 943 40 37ms 25 Dec 2023 172nd Lydxn 🇨🇦 943 40 39ms 29 Dec 2023 172nd 4hg 🇺🇸 943 40 36ms 8 Jan 2024 172nd xsot 🇸🇬 943 40 37ms 31 Jan 2024 172nd sisyphus-ppcg 🇦🇺 943 40 37ms 29 Apr 2024 172nd radarek 🇵🇱 943 40 41ms 7 Jul 2024 172nd nwellnhof 🇩🇪 943 40 40ms 24 Sep 2024 172nd sean-niemann 🇺🇸 943 40 38ms 20 Dec 2024 172nd stefangimmillaro 943 40 39ms 23 May 2025 172nd pardouin 🇫🇷 943 40 37ms 1 Sep 2025 172nd D-MOVE 🇵🇭 943 40 40ms 8 Dec 2025 172nd denkyuu1 943 40 38ms 5 Feb 2026 172nd Natanaelel 🇸🇪 943 40 41ms 6 days ago 188th jmerle 🇳🇱 941 17 242ms 15 Jun 2023 188th Yewzir 🇧🇪 941 17 240ms 9 Apr 2024 188th xyangst 941 17 258ms 15 Oct 2024 188th ZakkkkAttackkkk 🇵🇭 941 17 278ms 25 Feb 2025 188th blaztoma 🇱🇹 941 17 245ms 19 Oct 2025 188th Emutis 🇱🇹 941 17 285ms 19 Oct 2025 188th CrookedJ 941 17 227ms 2 Dec 2025 195th btjones0 936 70 15ms 2 May 2023 195th zloyrusskiy 936 70 18ms 26 Jun 2023 195th FlorianCassayre 🇫🇷 936 70 16ms 24 Sep 2023 198th Shanethegamer 🇺🇸 936 72 52ms 26 May 2023 198th jared-hughes 936 72 52ms 28 Jul 2023 198th iczelia 🇩🇪 936 72 55ms 16 Jan 2026 201st btnlq 934 63 467ms 17 Apr 2023 201st JayXon 🇺🇸 934 63 464ms 18 Apr 2023 201st nwellnhof 🇩🇪 934 63 406ms 19 Apr 2023 201st primo-ppcg 🇹🇭 934 63 414ms 21 Apr 2023 201st Yewzir 🇧🇪 934 63 416ms 9 May 2023 201st NoxiousPluK 934 63 422ms 18 May 2023 201st ericlangedijk 🇸🇮 934 63 423ms 18 May 2023 201st Lydxn 🇨🇦 934 63 419ms 19 May 2023 201st annaproxy 934 63 400ms 19 May 2023 201st wiz0u 934 63 397ms 20 May 2023 201st revlayle 🇺🇸 934 63 407ms 6 Jun 2023 201st AdrienHache 🇫🇷 934 63 413ms 14 Jun 2023 201st jmerle 🇳🇱 934 63 470ms 15 Jun 2023 201st Theremon72 934 63 408ms 21 Jan 2024 201st namelessiw 934 63 386ms 5 May 2024 201st Steffan153 🇫🇮 934 63 427ms 9 Aug 2024 201st sean-niemann 🇺🇸 934 63 443ms 22 Aug 2024 201st pardouin 🇫🇷 934 63 415ms 21 Sep 2024 201st edsrzf 🇳🇿 934 63 450ms 12 Nov 2024 201st Yax42 🇫🇷 934 63 432ms 30 Nov 2024 201st tomtheisen 🇺🇸 934 63 432ms 10 Feb 2025 201st fuzzylojik-golf 🇺🇸 934 63 422ms 23 May 2025 201st stefangimmillaro 934 63 473ms 18 Jun 2025 201st tomh1012 934 63 404ms 28 Aug 2025 201st CaedenHarper 🇨🇦 934 63 414ms 17 Oct 2025 201st EvilFonti 934 63 436ms 12 Nov 2025 201st amazingalek 🇳🇴 934 63 450ms 29 Dec 2025 201st mwarvik 🇳🇴 934 63 445ms 3 Jan 2026 201st raphaelimahorn 934 63 457ms 15 days ago 230th sisyphus-ppcg 🇦🇺 928 47 5ms 17 Apr 2023 230th Lydxn 🇨🇦 928 47 5ms 17 Apr 2023 230th primo-ppcg 🇹🇭 928 47 5ms 17 Apr 2023 230th stefangimmillaro 928 47 5ms 28 Apr 2023 230th xsot 🇸🇬 928 47 5ms 10 Apr 2024 230th Steffan153 🇫🇮 928 47 5ms 20 Jul 2024 230th sean-niemann 🇺🇸 928 47 5ms 21 Jul 2024 230th fuzzylojik-golf 🇺🇸 928 47 6ms 27 May 2025 230th targrik 928 47 6ms 19 Jun 2025 230th edsrzf 🇳🇿 928 47 5ms 20 Jul 2025 240th Lydxn 🇨🇦 924 66 351ms 16 Jan 2024 First Prev 161–240 of 1,507 Next Last