The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 8 days. Why not try and solve them ahead of time?
Diamonds 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 561st karadigm01 683 196 2ms 13 days ago 562nd DestyNova 🇮🇪 682 96 1,279ms 13 Aug 2022 562nd fuzzylojik-golf 🇺🇸 682 96 1,282ms 2 hours ago 564th sean-niemann 🇺🇸 681 134 436ms 4 Jan 2022 564th keelimeguy 🇺🇸 681 134 435ms 4 Nov 2023 566th retrohun 679 85 1ms 25 Aug 2024 567th janbehrens 🇩🇪 679 106 9ms 20 Jul 2022 567th DialFrost 🇸🇬 679 106 9ms 5 Oct 2023 567th KasperKivimaeki 🇫🇮 679 106 14ms 11 days ago 570th sean-niemann 🇺🇸 679 113 1ms 5 Jan 2022 570th Heathcorp 🇦🇺 679 113 1ms 25 Oct 2022 570th snoozingnewt 🇨🇦 679 113 1ms 23 Sep 2023 570th madex 🇩🇪 679 113 2ms 9 Jul 2024 570th LostSyntax21 🇬🇧 679 113 2ms 2 Dec 2024 570th LvLError 679 113 1ms 29 May 2025 570th Lv0Sys 🇵🇱 679 113 2ms 30 May 2025 570th dokutan 679 113 2ms 14 days ago 578th Shanethegamer 🇺🇸 679 114 152ms 10 Dec 2022 579th qpwoeirut 679 131 2,675ms 9 days ago 580th yokasuretsu 678 54 144ms 21 Jun 2018 581st jacklynnepenick 678 81 17ms 20 Aug 2021 582nd cbrt-x 678 115 112ms 4 Oct 2023 583rd AdrienHache 🇫🇷 678 126 430ms 30 Nov 2025 584th bzijlema 🇳🇱 677 160 292ms 30 Jan 2024 585th jacobly0 🇺🇸 677 227 1,725ms 22 Apr 2024 586th AutumnWind75 676 135 451ms 10 Dec 2025 587th emplv 🇱🇻 675 93 5ms 3 Oct 2023 588th pilaf 🇦🇷 675 97 1,398ms 6 Apr 2022 588th Andriamanitra 🇫🇮 675 97 1,330ms 2 Jan 2024 590th steffan-polygolf 675 116 301ms 7 Mar 2024 591st janbehrens 🇩🇪 672 127 423ms 17 Apr 2025 591st MeWhenI 🇻🇦 672 127 397ms 19 Jun 2025 593rd verticallity 672 137 153ms 6 Apr 2022 594th dcgjb 671 71 283ms 4 Jun 2024 595th RockOfStone 671 120 2ms 9 Mar 2024 596th dokutan 671 273 79ms 2 days ago 597th daedals 670 82 17ms 19 Jun 2019 597th FlorianCassayre 🇫🇷 670 82 12ms 24 May 2024 597th HumanoidCPU 670 82 11ms 9 May 2025 597th KasperKivimaeki 🇫🇮 670 82 16ms 11 days ago 601st minetoblend 669 133 2,742ms 9 Oct 2025 602nd lynn 668 48 33ms 9 May 2021 603rd elgan65536 🇺🇸 668 138 131ms 22 Oct 2023 604th SirBogman 🇺🇸 667 39 39ms 11 Nov 2022 604th T193R-W00D5 667 39 40ms 21 Apr 2025 606th error256 666 106 153ms 14 days ago 607th eddiesmithxyz 666 117 122ms 15 Jan 2023 608th Phil-RGOMEGA 666 121 2ms 31 May 2023 609th MeWhenI 🇻🇦 665 110 39ms 29 Apr 2025 610th prplz 🇦🇺 665 137 526ms 20 Oct 2020 611th lukechampine 665 163 290ms 19 Apr 2020 611th MeWhenI 🇻🇦 665 163 316ms 10 Feb 2023 613th Shanethegamer 🇺🇸 664 125 11ms 14 Jun 2024 614th Feniske 🇫🇷 662 72 265ms 10 Nov 2023 615th Bonjour27891 🇻🇳 662 83 10ms 15 Jul 2022 615th SB-945 662 83 10ms 17 Apr 2024 615th solisolu 662 83 9ms 6 Nov 2025 615th lelbal 662 83 10ms 16 Jan 2026 619th emgordon154 662 88 132ms 6 Sep 2024 620th Grrisly 662 116 1ms 7 Nov 2023 621st primo-ppcg 🇹🇭 662 117 151ms 1 May 2023 622nd MeWhenI 🇻🇦 662 119 123ms 15 Oct 2022 623rd aposteriorist 🇨🇦 662 136 432ms 4 Mar 2022 624th kops-cg 661 118 133ms 14 Apr 2021 625th MateuszPietrzak 🇵🇱 661 138 2,882ms 17 Nov 2023 626th stefangimmillaro 660 109 9ms 17 Oct 2023 626th KrausRaus 🇺🇸 660 109 8ms 13 Dec 2023 626th olleicua 🇺🇸 660 109 9ms 5 Feb 2024 626th junkondo-jp 660 109 10ms 30 Jun 2024 626th targrik 660 109 14ms 8 Jun 2025 626th Yax42 🇫🇷 660 109 12ms 20 Jan 2026 632nd Shanethegamer 🇺🇸 660 138 103ms 29 Apr 2022 633rd Babafaba 659 79 472ms 12 Nov 2025 634th clockworknazo 656 87 2ms 15 Nov 2022 634th dokutan 656 87 326ms 30 Apr 2024 636th bendapootie 656 117 2ms 10 Jul 2020 637th Natanaelel 🇸🇪 654 49 3ms 20 Jul 2023 637th lifthrasiir 🇰🇷 654 49 2ms 28 Nov 2024 637th emgordon154 654 49 2ms 18 Nov 2025 640th juan-cazalvilla 654 84 11ms 1 Aug 2022 First Prev 561–640 of 2,541 Next Last