The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 hours. Why not try and solve them ahead of time?
Tongue-twisters 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 161st error256 884 164 478ms 13 Aug 2024 162nd sisyphus-ppcg 🇦🇺 883 208 1,284ms 7 Mar 2022 163rd SirBogman 🇺🇸 883 404 39ms 2 Jul 2023 164th inventshah 882 337 2ms 4 Nov 2022 165th Mukundan314 879 270 27ms 21 Jul 2025 166th emgordon154 879 325 4ms 28 Dec 2024 167th emgordon154 879 398 1,806ms 20 Oct 2024 168th albanian-laundromat 878 191 1,304ms 26 Oct 2025 169th stefangimmillaro 878 264 135ms 4 Jun 2025 170th MeWhenI 🇻🇦 875 326 3ms 25 May 2022 171st hallvabo 🇳🇴 872 170 17ms 6 Jan 2024 172nd janlelis 870 172 32ms 21 Sep 2024 173rd akshatj27 🇦🇶 869 208 10ms 11 Jan 2022 174th sean-niemann 🇺🇸 868 186 127ms 8 Aug 2024 175th MeWhenI 🇻🇦 868 368 24ms 20 Jun 2023 176th dokutan 867 469 7ms 23 Feb 2026 177th Lydxn 🇨🇦 866 171 10ms 3 Oct 2020 178th sean-niemann 🇺🇸 866 228 8ms 5 Jan 2026 179th tomtheisen 🇺🇸 865 189 450ms 16 Feb 2023 180th HPWiz 🇳🇿 865 255 113ms 24 Sep 2025 181st lynn 862 256 1,101ms 15 Jul 2021 182nd Alex-x90 🇺🇸 859 230 2ms 23 Feb 2023 183rd Alex-x90 🇺🇸 858 249 413ms 11 Jul 2023 184th Mukundan314 858 256 1,279ms 30 Jun 2025 185th primo-ppcg 🇹🇭 858 295 16ms 3 Feb 2022 186th Mukundan314 856 253 6ms 8 Jul 2025 187th dokutan 855 378 16ms 7 days ago 188th MeWhenI 🇻🇦 848 221 3ms 28 Nov 2021 189th prplz 🇦🇺 848 233 2ms 25 Jun 2021 190th mokymok 🇺🇸 847 175 9ms 23 Jul 2021 190th neel11235813 847 175 10ms 23 Mar 2024 192nd MeWhenI 🇻🇦 846 177 34ms 25 Dec 2021 192nd nwellnhof 🇩🇪 846 177 34ms 28 Dec 2021 194th error256 846 196 2,621ms 24 Oct 2024 195th error256 846 225 593ms 24 Sep 2025 196th MeWhenI 🇻🇦 844 318 5ms 3 Jul 2023 197th galloj 🇨🇿 844 338 2ms 24 Feb 2023 198th olivermrose 🇺🇸 841 178 34ms 26 Nov 2021 199th MichalMarsalek 🇨🇿 841 258 588ms 5 Nov 2022 200th dokutan 841 339 1ms 28 Mar 2025 201st Mukundan314 840 276 111ms 2 Jul 2025 202nd dokutan 837 153 76ms 23 Jan 2026 203rd m-tkach 🇺🇦 837 177 9ms 6 Oct 2022 203rd duckyluuk 🇳🇱 837 177 9ms 15 Aug 2024 203rd FortuiteMan 🇫🇷 837 177 10ms 20 Jul 2025 203rd Steffan153 🇫🇮 837 177 10ms 21 Feb 2026 203rd snoozingnewt 🇨🇦 837 177 10ms 26 days ago 208th albanian-laundromat 836 252 3ms 6 Nov 2025 209th sisyphus-ppcg 🇦🇺 835 283 292ms 7 Mar 2022 210th kg583 🇺🇸 835 342 4ms 24 Jan 2026 211th lifthrasiir 🇰🇷 835 364 7ms 19 Dec 2024 212th sean-niemann 🇺🇸 834 342 1ms 20 May 2023 212th jacobly0 🇺🇸 834 342 2ms 2 Sep 2023 214th neel11235813 833 174 394ms 23 Mar 2024 215th thisishowmymindworks 🇳🇴 832 178 9ms 10 Oct 2020 215th Alex-x90 🇺🇸 832 178 10ms 12 Mar 2022 217th GolfingSuccess 🇬🇷 828 179 10ms 10 Oct 2020 218th dokutan 827 181 36ms 21 Apr 2025 219th ovs-code 🇩🇪 827 252 2ms 22 Aug 2024 220th dokutan 826 203 1,076ms 30 Aug 2025 221st stefangimmillaro 826 345 1ms 27 Jul 2025 222nd itsh01 825 219 10ms 9 Jun 2022 223rd Steffan153 🇫🇮 824 176 411ms 26 Feb 2026 224th orthoplex 🇨🇽 823 180 10ms 9 Oct 2022 224th SirBogman 🇺🇸 823 180 18ms 22 Jan 2024 224th namelessiw 823 180 15ms 17 Apr 2024 227th ovs-code 🇩🇪 823 268 114ms 23 Aug 2024 228th selketdaly 823 326 5ms 2 Feb 2021 229th snoozingnewt 🇨🇦 822 347 1ms 3 Oct 2025 230th josh-h-90 821 327 4ms 2 Feb 2021 231st MarcMush 🇫🇷 820 182 285ms 13 Jan 2024 232nd duckyluuk 🇳🇱 819 177 425ms 29 Aug 2024 233rd dokutan 819 219 7ms 19 Oct 2024 234th KasperKivimaeki 🇫🇮 819 241 8ms 4 Jun 2025 235th jbbarth 🇫🇷 818 183 36ms 27 Aug 2021 236th Mukundan314 818 231 213ms 8 Jul 2025 237th sean-niemann 🇺🇸 818 289 294ms 9 Jan 2026 238th GrayJoKing 🇦🇺 817 391 29ms 20 Jan 2023 239th ovs-code 🇩🇪 816 246 3ms 5 Oct 2024 240th btnlq 815 186 273ms 10 Dec 2021 First Prev 161–240 of 2,391 Next Last