The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 days. Why not try and solve them ahead of time?
Musical Chords 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 241st MeWhenI 🇻🇦 554 216 209ms 5 Nov 2021 242nd GrayJoKing 🇦🇺 549 109 234ms 23 Jan 2023 243rd neel11235813 549 146 19ms 10 Oct 2023 244th blaztoma 🇱🇹 545 147 11ms 25 Dec 2025 245th Lv0Sys 🇵🇱 544 176 14ms 24 days ago 246th albanian-laundromat 544 621 13ms 4 days ago 247th tayloia 🇬🇧 541 177 12ms 23 May 2023 248th itsh01 535 179 12ms 25 May 2022 249th bricknellj 534 150 17ms 23 May 2024 250th MeWhenI 🇻🇦 531 389 18ms 18 Nov 2021 251st primo-ppcg 🇹🇭 524 153 11ms 20 Nov 2021 252nd dmrichwa 🇺🇸 523 183 12ms 30 Dec 2022 253rd namelessiw 521 203 485ms 8 Aug 2025 254th commandz0 🇺🇸 520 154 13ms 22 Aug 2023 254th ryyyn 🇺🇸 520 154 35ms 28 Oct 2025 256th jared-hughes 518 229 2ms 17 Jul 2022 257th janbehrens 🇩🇪 518 249 13ms 2 Jul 2023 258th yzhs 🇩🇪 517 155 19ms 5 Jun 2022 259th MeWhenI 🇻🇦 515 236 451ms 5 Mar 2022 260th MeWhenI 🇻🇦 514 246 186ms 15 Dec 2022 261st edsrzf 🇳🇿 514 363 300ms 23 Nov 2025 262nd MeWhenI 🇻🇦 512 407 44ms 29 Apr 2025 263rd neel11235813 507 146 427ms 15 Jan 2024 264th NewDefectus 🇮🇱 507 234 2ms 27 Nov 2021 265th jeff-at-tamer-dot-codes 🇺🇸 504 159 17ms 23 Aug 2023 266th voytxt 🇨🇿 504 190 16ms 4 Apr 2025 267th MeWhenI 🇻🇦 503 296 6ms 2 Oct 2022 268th HumanoidCPU 501 160 14ms 5 May 2025 269th MeWhenI 🇻🇦 497 261 5ms 6 Aug 2023 270th lynn 496 248 3ms 9 Nov 2021 271st janlelis 495 133 41ms 4 Nov 2021 272nd guilhem-roy 🇫🇷 495 162 21ms 5 Oct 2022 272nd Flekay 🇩🇪 495 162 18ms 12 Feb 2026 274th bitsandbeyond 🇳🇱 492 163 11ms 11 Nov 2025 275th MeWhenI 🇻🇦 492 262 7ms 3 Jul 2023 276th MeWhenI 🇻🇦 492 291 8ms 10 Sep 2022 277th jared-hughes 480 137 41ms 12 Sep 2022 277th bitsandbeyond 🇳🇱 480 137 36ms 11 Nov 2025 279th inventshah 480 167 19ms 14 Nov 2022 279th SB-945 480 167 12ms 11 Mar 2024 281st sean-niemann 🇺🇸 480 469 47ms 30 Oct 2023 282nd primo-ppcg 🇹🇭 479 182 26ms 11 Feb 2022 283rd MeWhenI 🇻🇦 479 298 440ms 7 Nov 2025 284th MeWhenI 🇻🇦 476 399 33ms 6 Jun 2023 285th HumanoidCPU 475 156 428ms 5 May 2025 286th stefangimmillaro 474 169 11ms 19 Dec 2022 287th olleicua 🇺🇸 473 139 36ms 1 Oct 2024 288th MeWhenI 🇻🇦 471 202 7ms 16 Aug 2024 289th inventshah 469 158 596ms 22 Jan 2024 290th elgan65536 🇺🇸 468 363 428ms 10 Apr 2024 291st MeWhenI 🇻🇦 464 173 1,221ms 9 Nov 2021 292nd Carltoffel 🇩🇪 463 450 49ms 24 Feb 2025 293rd NewDefectus 🇮🇱 461 174 20ms 25 Nov 2021 294th Lv0Sys 🇵🇱 458 175 19ms 24 days ago 295th Argeento 🇵🇱 456 210 11ms 9 Sep 2023 296th tobeannouncd 456 301 160ms 8 Jan 2024 297th MeWhenI 🇻🇦 456 528 1,696ms 7 Nov 2025 298th Natanaelel 🇸🇪 451 146 38ms 5 Sep 2024 298th Lv0Sys 🇵🇱 451 146 41ms 23 days ago 300th annaproxy 450 178 21ms 8 Jun 2022 300th LostSyntax21 🇬🇧 450 178 20ms 17 days ago 302nd CaedenHarper 🇨🇦 450 192 1,467ms 14 Sep 2025 303rd o0lit3 🇺🇸 449 147 9ms 7 Jun 2022 304th jared-hughes 449 164 33ms 3 Nov 2021 305th RockOfStone 446 276 2ms 8 Nov 2021 306th jared-hughes 445 180 20ms 11 Apr 2022 307th janbehrens 🇩🇪 445 273 445ms 25 Mar 2022 308th MeWhenI 🇻🇦 445 313 71ms 6 Nov 2023 309th MeWhenI 🇻🇦 443 319 156ms 22 Feb 2023 310th KatieLG 🇬🇧 439 218 11ms 3 Oct 2025 311th scpchicken 🇵🇼 434 152 22ms 25 Feb 2023 312th Natanaelel 🇸🇪 431 319 162ms 28 Jun 2025 313th snoozingnewt 🇨🇦 429 329 158ms 20 Nov 2025 314th MeWhenI 🇻🇦 428 290 115ms 16 Oct 2022 315th didion0 🇺🇸 424 226 15ms 28 Feb 2022 316th CatsAreFluffy 424 353 75ms 4 Feb 2023 317th MeWhenI 🇻🇦 419 308 526ms 26 Aug 2023 318th janbehrens 🇩🇪 416 230 12ms 8 Jun 2023 319th tatzyr 🇯🇵 414 159 40ms 29 Mar 2025 320th MeWhenI 🇻🇦 414 658 28ms 17 Mar 2022 First Prev 241–320 of 627 Next Last