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 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 160th CatsAreFluffy 857 56 11ms 15 Dec 2022 160th FlorianCassayre 🇫🇷 857 56 11ms 12 Sep 2023 160th duckyluuk 🇳🇱 857 56 11ms 28 Feb 2024 164th IanUtley 856 360 17ms 16 Apr 2024 165th dvargas46 🇺🇸 855 204 17ms 19 Jan 2023 166th GrayJoKing 🇦🇺 855 265 3,176ms 24 Nov 2023 167th snoozingnewt 🇨🇦 853 241 177ms 13 Sep 2025 168th rucin93 🇵🇱 853 243 6ms 8 Dec 2025 169th sean-niemann 🇺🇸 852 297 249ms 6 Jun 2025 170th hallvabo 🇳🇴 851 131 21ms 31 Dec 2023 171st primo-ppcg 🇹🇭 851 205 8ms 26 Mar 2019 172nd prestosilver 🇺🇸 851 371 441ms 16 days ago 173rd primo-ppcg 🇹🇭 850 470 63ms 25 Jun 2022 174th stefangimmillaro 847 160 690ms 10 Jun 2023 175th albanian-laundromat 847 285 4ms 6 Jul 2025 176th MeWhenI 🇻🇦 846 303 1,030ms 10 Jan 2025 177th CatsAreFluffy 845 197 14ms 14 Dec 2022 178th MeepMoop 845 224 3ms 10 Apr 2025 179th snoozingnewt 🇨🇦 845 304 94ms 19 Oct 2025 180th Natanaelel 🇸🇪 843 352 223ms 18 Jun 2025 181st Shanethegamer 🇺🇸 843 433 300ms 31 Dec 2023 182nd Natanaelel 🇸🇪 842 57 11ms 23 Oct 2021 182nd destofr 842 57 11ms 13 Oct 2022 182nd jmerle 🇳🇱 842 57 11ms 17 Jul 2023 182nd msbranicky 842 57 11ms 28 Aug 2023 182nd commandz0 🇺🇸 842 57 11ms 26 Sep 2023 182nd roupiq 🇵🇱 842 57 11ms 23 Feb 2024 188th frosster 🇨🇦 842 225 4ms 7 Feb 2026 189th sean-niemann 🇺🇸 842 246 6ms 8 Dec 2025 190th MeWhenI 🇻🇦 841 473 50ms 17 May 2023 191st rambox11 840 198 13ms 19 Jul 2018 192nd emplv 🇱🇻 840 326 15ms 30 Apr 2024 193rd Shanethegamer 🇺🇸 840 368 7ms 24 Mar 2024 194th Shanethegamer 🇺🇸 840 376 2,834ms 28 Oct 2024 195th lynn 839 386 1,643ms 2 Nov 2021 196th lifthrasiir 🇰🇷 838 133 21ms 16 Nov 2024 197th GrayJoKing 🇦🇺 838 314 28ms 7 Jun 2021 198th 386asm 🇺🇸 838 404 45ms 18 Apr 2023 199th Shanethegamer 🇺🇸 837 328 117ms 26 Oct 2022 200th lynn 837 430 237ms 6 Aug 2023 201st pardouin 🇫🇷 833 379 3,001ms 6 Feb 2025 202nd GrayJoKing 🇦🇺 832 134 34ms 1 Nov 2023 203rd MarcMush 🇫🇷 832 165 970ms 15 Nov 2023 204th primo-ppcg 🇹🇭 832 308 29ms 12 Feb 2022 205th lifthrasiir 🇰🇷 832 397 40ms 20 Dec 2024 206th UnderKoen 🇳🇱 831 418 15ms 20 Jan 2025 207th MichalMarsalek 🇨🇿 828 58 11ms 29 Dec 2022 208th sean-niemann 🇺🇸 828 172 170ms 28 Oct 2024 209th somebody1234 828 201 12ms 12 Nov 2018 209th JOrE20 828 201 13ms 25 Dec 2025 211th Shanethegamer 🇺🇸 828 288 400ms 24 Sep 2025 212th FlyingPenguin223 827 229 4ms 11 Dec 2024 213th xsot 🇸🇬 827 331 12ms 8 Jun 2025 214th Shanethegamer 🇺🇸 827 435 31ms 10 Feb 2026 215th MeWhenI 🇻🇦 826 365 148ms 2 days ago 216th prplz 🇦🇺 824 202 16ms 24 Mar 2019 217th duckyluuk 🇳🇱 824 406 16ms 15 Feb 2025 218th MeWhenI 🇻🇦 823 141 47ms 29 Apr 2024 219th GrayJoKing 🇦🇺 823 419 8ms 8 Aug 2023 220th Shanethegamer 🇺🇸 822 384 401ms 11 Nov 2023 221st lynn 822 434 236ms 18 Oct 2024 222nd Argeento 🇵🇱 820 203 14ms 30 Sep 2020 222nd dmrichwa 🇺🇸 820 203 12ms 4 Jun 2022 224th MeWhenI 🇻🇦 820 334 11ms 3 Jul 2023 225th MichalMarsalek 🇨🇿 820 385 403ms 16 Aug 2023 226th snoozingnewt 🇨🇦 819 493 113ms 13 Dec 2025 227th Shanethegamer 🇺🇸 818 543 1,485ms 30 May 2025 228th MeWhenI 🇻🇦 817 554 1,815ms 22 Apr 2024 229th MeWhenI 🇻🇦 816 166 951ms 8 Mar 2023 230th primo-ppcg 🇹🇭 815 661 24ms 21 May 2025 231st Garklein 🇨🇦 814 59 11ms 4 Jan 2022 232nd MeWhenI 🇻🇦 811 293 430ms 9 Aug 2024 233rd Lydxn 🇨🇦 811 294 429ms 18 Dec 2021 234th MeWhenI 🇻🇦 810 413 24ms 1 Jan 2025 235th nipzu 809 441 253ms 13 Jun 2022 236th pardouin 🇫🇷 808 297 1,408ms 15 Aug 2025 237th Shanethegamer 🇺🇸 808 317 1,193ms 27 Oct 2024 238th kumavale 807 442 248ms 13 Nov 2025 239th GolfingSuccess 🇬🇷 806 100 20ms 28 Feb 2025 240th frobinsonj 804 207 13ms 6 Dec 2019 First Prev 161–240 of 1,081 Next Last