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 401st neel11235813 283 419 2ms 1 Apr 2024 402nd jacklynnepenick 281 285 13ms 22 Feb 2022 402nd OllieBoyne 🇬🇧 281 285 15ms 21 Aug 2022 404th vroup 🇩🇰 281 341 12ms 2 Oct 2022 405th mbittner20 280 286 12ms 8 Jul 2024 406th jeff-at-tamer-dot-codes 🇺🇸 279 436 169ms 27 Aug 2023 407th neel11235813 278 380 431ms 1 Apr 2024 408th dokutan 277 267 373ms 14 Feb 2026 409th snoozingnewt 🇨🇦 277 429 2ms 9 Oct 2025 410th CaedenHarper 🇨🇦 276 677 308ms 3 Nov 2025 411th jeff-at-tamer-dot-codes 🇺🇸 275 384 457ms 25 Aug 2023 411th snoozingnewt 🇨🇦 275 384 455ms 14 Jan 2025 413th loganmacdougall 🇨🇦 275 520 460ms 7 Nov 2021 414th m-tkach 🇺🇦 274 292 33ms 10 Jan 2022 415th CaedenHarper 🇨🇦 273 523 391ms 7 Oct 2025 416th scpchicken 🇵🇼 271 296 59ms 20 Feb 2024 417th jeff-at-tamer-dot-codes 🇺🇸 271 438 2ms 26 Aug 2023 418th nullie 269 298 12ms 10 Jun 2022 419th heanyang1 267 396 423ms 23 May 2025 420th targrik 267 483 6ms 29 Jan 2025 421st CaedenHarper 🇨🇦 264 363 10ms 31 Aug 2025 422nd knutae 🇳🇴 263 305 13ms 13 Nov 2021 423rd dillon-duncando 262 306 19ms 3 Oct 2022 424th alexsave 261 367 11ms 19 Nov 2024 425th croc54 259 310 19ms 15 Jan 2025 425th andrewjc2000 259 310 14ms 26 Aug 2025 427th CaedenHarper 🇨🇦 257 312 32ms 12 Jan 2026 428th BREMAUCY 🇫🇷 256 313 19ms 33 hours ago 429th HumanoidCPU 256 475 490ms 14 Jan 2026 430th scpchicken 🇵🇼 255 579 14ms 12 Dec 2023 431st CatsAreFluffy 254 315 19ms 4 Feb 2023 432nd neihousaigaai 250 321 12ms 24 Nov 2024 433rd ridingqwerty 🇺🇸 247 324 18ms 7 Feb 2024 434th MeWhenI 🇻🇦 247 364 109ms 26 May 2022 435th CaedenHarper 🇨🇦 244 303 863ms 2 Oct 2025 436th HumanoidCPU 242 437 461ms 12 Jan 2026 437th retrohun 242 563 366ms 10 Nov 2021 438th MeWhenI 🇻🇦 242 1,188 1,434ms 9 Feb 2025 439th bwat2 241 592 497ms 1 Dec 2021 440th CedricGebistorf 240 334 40ms 12 Mar 2022 440th eiburns 240 334 13ms 21 Sep 2023 442nd Yewzir 🇧🇪 240 1,003 2,160ms 14 Nov 2025 443rd MeWhenI 🇻🇦 235 638 489ms 8 May 2022 444th CatsAreFluffy 231 320 624ms 15 Jan 2024 445th CaedenHarper 🇨🇦 229 461 404ms 17 Oct 2025 446th madex 🇩🇪 228 352 19ms 4 Feb 2025 447th martinnorling 🇸🇪 227 353 20ms 11 Mar 2022 448th m42km 226 354 22ms 4 Feb 2024 449th Yewzir 🇧🇪 226 661 570ms 20 Feb 2023 450th Mabeloid 🇳🇴 225 329 848ms 4 May 2025 451st madex 🇩🇪 224 529 2ms 4 Feb 2025 452nd msbranicky 223 359 13ms 7 Sep 2023 453rd scpchicken 🇵🇼 222 270 244ms 4 Apr 2022 454th IISResetMe 222 353 2,267ms 30 Dec 2025 455th jfallon1997 221 363 22ms 24 Jun 2024 456th m42km 218 340 748ms 4 Feb 2024 457th codereport 🇨🇦 216 632 1,355ms 17 Apr 2025 458th kmathis22 216 662 405ms 17 days ago 459th gigaprofisi 🇺🇸 215 445 11ms 17 Dec 2025 460th mathisfun271 209 384 34ms 14 Oct 2024 461st AstroOrbis 208 385 19ms 17 Feb 2026 462nd acollett89 207 462 12ms 18 Jul 2025 463rd msbranicky 206 359 841ms 17 Jan 2024 464th madex 🇩🇪 202 473 14ms 4 Feb 2025 465th MeWhenI 🇻🇦 200 594 3ms 5 Jul 2024 466th tomh1012 198 533 459ms 12 Nov 2025 467th dokutan 196 695 1,466ms 22 Jun 2025 468th alemelis 195 410 18ms 12 Sep 2024 469th dokutan 194 366 621ms 5 May 2024 470th za3k 194 414 14ms 31 Dec 2022 471st twocatsinatrenchcoat 186 430 13ms 16 Apr 2022 471st aksyristos 186 430 18ms 20 Feb 2026 473rd mokymok 🇺🇸 185 433 19ms 17 Nov 2021 474th alemelis 183 404 778ms 11 Oct 2024 475th Yewzir 🇧🇪 183 664 440ms 24 Feb 2023 476th MarcMush 🇫🇷 179 447 20ms 18 Jan 2024 477th msbranicky 177 771 1,412ms 25 Oct 2023 478th madex 🇩🇪 175 375 40ms 4 Feb 2025 479th MeWhenI 🇻🇦 172 793 164ms 18 Nov 2023 480th BREMAUCY 🇫🇷 165 639 483ms 17 days ago First Prev 401–480 of 627 Next Last