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?
Spelling Numbers 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 161st nathanadams 🇳🇿 865 311 12ms 20 Sep 2021 162nd sisyphus-ppcg 🇦🇺 864 205 6ms 2 Feb 2024 163rd ovs-code 🇩🇪 864 209 4ms 18 Jan 2025 164th xnor-gate 860 221 37ms 6 Apr 2021 164th btnlq 860 221 36ms 21 Dec 2021 164th ryyyn 🇺🇸 860 221 37ms 28 Oct 2025 167th JayXon 🇺🇸 860 278 43ms 21 Aug 2022 168th Steffan153 🇫🇮 859 200 502ms 11 Feb 2026 169th massung 857 56 9ms 26 Mar 2019 169th CatsAreFluffy 857 56 11ms 15 Dec 2022 169th FlorianCassayre 🇫🇷 857 56 11ms 12 Sep 2023 169th duckyluuk 🇳🇱 857 56 11ms 28 Feb 2024 173rd MeWhenI 🇻🇦 857 344 435ms 19 Jun 2025 174th IanUtley 856 360 17ms 16 Apr 2024 175th sean-niemann 🇺🇸 855 201 458ms 5 Feb 2026 176th dvargas46 🇺🇸 855 204 17ms 19 Jan 2023 177th primo-ppcg 🇹🇭 855 231 1,832ms 7 Feb 2023 178th GrayJoKing 🇦🇺 855 265 3,176ms 24 Nov 2023 179th JayXon 🇺🇸 855 305 188ms 27 Jul 2025 180th trinityy-7 854 315 12ms 15 Mar 2024 181st MeWhenI 🇻🇦 853 385 5ms 5 Jul 2024 182nd jared-hughes 853 397 3ms 10 Sep 2022 183rd ovs-code 🇩🇪 852 223 18ms 6 Aug 2024 183rd lifthrasiir 🇰🇷 852 223 15ms 15 Nov 2024 185th sean-niemann 🇺🇸 852 297 249ms 6 Jun 2025 186th Shanethegamer 🇺🇸 852 351 477ms 26 Oct 2024 187th primo-ppcg 🇹🇭 851 205 8ms 26 Mar 2019 188th prestosilver 🇺🇸 851 371 441ms 17 days ago 189th kg583 🇺🇸 850 202 498ms 25 Feb 2026 190th Waffle3z 850 398 3ms 23 Sep 2021 191st primo-ppcg 🇹🇭 850 470 63ms 25 Jun 2022 192nd stefangimmillaro 847 160 690ms 10 Jun 2023 193rd pardouin 🇫🇷 846 203 442ms 5 Feb 2026 194th MeWhenI 🇻🇦 846 303 1,030ms 10 Jan 2025 195th clockworknazo 846 364 15ms 9 Aug 2023 196th dmrichwa 🇺🇸 844 319 12ms 4 Jun 2022 196th janbehrens 🇩🇪 844 319 14ms 30 Nov 2024 198th MeWhenI 🇻🇦 843 336 4ms 11 Oct 2023 199th Natanaelel 🇸🇪 843 352 223ms 18 Jun 2025 200th Natanaelel 🇸🇪 842 57 11ms 23 Oct 2021 200th destofr 842 57 11ms 13 Oct 2022 200th jmerle 🇳🇱 842 57 11ms 17 Jul 2023 200th msbranicky 842 57 11ms 28 Aug 2023 200th commandz0 🇺🇸 842 57 11ms 26 Sep 2023 200th roupiq 🇵🇱 842 57 11ms 23 Feb 2024 206th ovs-code 🇩🇪 842 350 128ms 3 Nov 2024 207th primo-ppcg 🇹🇭 842 402 3ms 6 Jul 2021 208th ovs-code 🇩🇪 842 412 443ms 3 Jun 2024 209th prestosilver 🇺🇸 841 320 11ms 3 days ago 210th Shanethegamer 🇺🇸 841 434 300ms 30 Dec 2023 211th MeWhenI 🇻🇦 841 473 50ms 17 May 2023 212th Shanethegamer 🇺🇸 840 294 290ms 18 Mar 2024 213th emplv 🇱🇻 840 326 15ms 30 Apr 2024 214th primo-ppcg 🇹🇭 840 351 386ms 21 Nov 2021 215th Shanethegamer 🇺🇸 840 368 7ms 24 Mar 2024 216th Shanethegamer 🇺🇸 840 372 3ms 11 Sep 2022 217th Shanethegamer 🇺🇸 840 376 2,834ms 28 Oct 2024 218th MeWhenI 🇻🇦 839 304 1,441ms 15 Sep 2025 219th lynn 839 386 1,643ms 2 Nov 2021 220th Shanethegamer 🇺🇸 839 394 182ms 1 Dec 2024 221st GrayJoKing 🇦🇺 838 314 28ms 7 Jun 2021 222nd KrausRaus 🇺🇸 838 321 14ms 11 Dec 2023 222nd Salutations45 838 321 16ms 10 Nov 2024 224th inventshah 838 392 4ms 27 Jan 2023 225th 386asm 🇺🇸 838 404 45ms 18 Apr 2023 226th Shanethegamer 🇺🇸 837 328 117ms 26 Oct 2022 227th lynn 837 430 237ms 6 Aug 2023 228th dgerblick 836 322 11ms 16 Jun 2023 229th lyphyser 835 276 49ms 14 Jul 2023 230th GrayJoKing 🇦🇺 835 369 12ms 9 Aug 2023 231st pardouin 🇫🇷 833 379 3,001ms 6 Feb 2025 232nd primo-ppcg 🇹🇭 832 308 29ms 12 Feb 2022 233rd tsunderu 🇯🇵 832 395 4ms 10 Sep 2021 234th lifthrasiir 🇰🇷 832 397 40ms 20 Dec 2024 235th inventshah 832 417 439ms 27 Jan 2023 236th UnderKoen 🇳🇱 831 418 15ms 20 Jan 2025 237th ovs-code 🇩🇪 830 288 39ms 9 Jul 2024 238th MichalMarsalek 🇨🇿 828 58 11ms 29 Dec 2022 239th xsot 🇸🇬 827 331 12ms 8 Jun 2025 240th Shanethegamer 🇺🇸 827 435 31ms 10 Feb 2026 First Prev 161–240 of 1,085 Next Last