The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
Cubes 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 638th Andrey2001 450 210 11ms 23 Nov 2025 642nd Shanethegamer 🇺🇸 450 440 474ms 25 Sep 2025 643rd adriweb 🇫🇷 449 264 10ms 21 Aug 2023 643rd tomh1012 449 264 10ms 21 Nov 2025 645th Lv0Sys 🇵🇱 448 185 35ms 2 Dec 2025 646th adamnielson42 🇺🇸 448 211 11ms 14 Apr 2023 646th BREMAUCY 🇫🇷 448 211 10ms 22 Feb 2024 648th juliansiebert 🇩🇪 447 211 230ms 22 Jul 2022 649th ShiraJoseph 🇺🇸 447 265 10ms 28 Apr 2022 650th Schmitt-Very-Cool 447 443 439ms 26 Sep 2025 651st galloj 🇨🇿 446 212 10ms 20 Aug 2022 651st RedzGoose 🇦🇺 446 212 10ms 14 Oct 2024 653rd roavin 446 385 368ms 7 Jun 2022 654th Maashau 445 390 3ms 25 Nov 2025 655th shen-hong-xin 444 213 10ms 9 Jul 2021 655th jfallon1997 444 213 10ms 16 Aug 2022 655th StefanHabel 🇨🇦 444 213 10ms 12 Dec 2022 658th lukasmoellerch 444 267 11ms 15 Jul 2019 659th janbehrens 🇩🇪 444 391 1ms 3 Jan 2022 660th p-vf 🇨🇭 443 388 386ms 21 Nov 2021 661st MichalMarsalek 🇨🇿 443 826 3ms 25 Dec 2022 662nd hjcafaroUC 442 214 10ms 1 Aug 2020 662nd AlephSquirrel 442 214 10ms 8 Jul 2022 662nd lomarbrick 442 214 10ms 22 May 2023 662nd stefangimmillaro 442 214 10ms 19 Jun 2023 662nd lhulinsky 442 214 10ms 21 Oct 2024 662nd qpwoeirut 442 214 9ms 16 Sep 2025 668th mrmena 🇦🇺 441 393 43ms 10 Jun 2024 669th jjgry 440 215 10ms 1 Mar 2021 669th jhpaques 🇫🇷 440 215 10ms 21 Sep 2022 671st yzhs 🇩🇪 440 348 125ms 25 Jul 2021 672nd olleicua 🇺🇸 440 832 3ms 15 Jul 2025 673rd olleicua 🇺🇸 439 270 11ms 9 Feb 2024 674th astdefu 439 395 3ms 10 Dec 2022 675th janbehrens 🇩🇪 439 433 2,871ms 20 Nov 2022 676th The3gs 438 216 10ms 13 Oct 2020 676th abailey2020 🇺🇸 438 216 9ms 13 Dec 2020 676th Pulencode 🇨🇨 438 216 10ms 14 Nov 2024 679th hamhub7 437 393 391ms 11 Aug 2022 680th KevinMarquette 🇺🇸 436 216 262ms 6 Jun 2020 681st knutae 🇳🇴 436 217 9ms 19 Jul 2019 681st bobbysq 436 217 10ms 22 Jul 2023 681st roguh 🇬🇹 436 217 9ms 20 Oct 2024 684th Pena86 436 445 181ms 2 Jan 2022 685th rambox11 435 399 3ms 12 Mar 2019 686th jared-hughes 434 191 35ms 11 Oct 2022 687th btjones0 434 218 21ms 15 Jul 2022 687th FranklinJiaChen 434 218 10ms 3 Jul 2024 687th EthanJantz 434 218 10ms 12 Aug 2025 690th adamnielson42 🇺🇸 434 273 10ms 25 Apr 2023 691st orthoplex 🇨🇽 433 693 2ms 9 Jun 2024 692nd cubed-guy 432 219 10ms 21 Aug 2021 692nd rowboat1 432 219 10ms 18 Jun 2022 692nd NerdyMcNerd42 432 219 10ms 20 Aug 2022 692nd smilesformiles3 432 219 11ms 14 Jun 2025 696th OllieBoyne 🇬🇧 430 220 13ms 2 Jun 2021 697th error256 430 340 39ms 29 Aug 2024 698th msbranicky 429 232 672ms 17 Jan 2024 699th bac0id 429 443 489ms 23 Feb 2024 700th NanduBC 428 221 10ms 18 Mar 2021 700th RandGuy 428 221 10ms 7 Sep 2022 700th aksyristos 428 221 9ms 29 Dec 2022 700th codingisgreatbutiamnot 428 221 10ms 14 Aug 2024 700th NotEvenIndian 428 221 10ms 22 Oct 2024 700th Sxltry 428 221 10ms 10 days ago 706th trinityy-7 428 277 11ms 5 Dec 2023 707th alexkunin 427 278 11ms 2 Jul 2019 708th eshilo-draper 426 222 10ms 1 Aug 2023 708th inverseLorentz 🇦🇺 426 222 11ms 9 May 2024 708th Ythaenagor 426 222 10ms 5 Aug 2024 711th SpareManiKatti 425 279 11ms 13 Oct 2021 712th jngbsn 425 408 3ms 17 Jul 2020 713th CedricGebistorf 424 223 11ms 6 Mar 2022 713th Trusly 424 223 10ms 26 Feb 2024 715th Florian-Mt 424 280 10ms 12 Jul 2024 716th Shanethegamer 🇺🇸 424 334 76ms 18 May 2025 717th giacomogallina 422 224 10ms 5 Jun 2019 717th AgathokakologicalBit 422 224 10ms 27 Jul 2019 717th Kloppermand 🇩🇰 422 224 11ms 8 Sep 2021 717th mbittner20 422 224 11ms 1 Jul 2024 First Prev 641–720 of 1,697 Next Last