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 640th kops-cg 654 84 16ms 26 Feb 2025 640th fuzzylojik-golf 🇺🇸 654 84 16ms 5 days ago 643rd TomvdPeet 654 96 5ms 4 Dec 2025 644th alexkunin 654 110 10ms 6 Jul 2019 645th dokutan 654 136 2,607ms 15 Jan 2026 646th ovs-code 🇩🇪 653 108 67ms 12 Sep 2024 647th stefangimmillaro 652 131 407ms 15 Jun 2025 648th primo-ppcg 🇹🇭 652 151 445ms 25 Sep 2020 649th ovs-code 🇩🇪 650 40 38ms 25 Feb 2025 650th GrayJoKing 🇦🇺 650 70 36ms 28 May 2021 650th plcc0 650 70 36ms 28 Dec 2025 652nd SirBogman 🇺🇸 650 80 486ms 15 Jan 2024 652nd Shanethegamer 🇺🇸 650 80 427ms 16 Jan 2024 654th DaCoolOne 650 124 2ms 21 Nov 2019 654th frosster 🇨🇦 650 124 1ms 2 Nov 2025 656th stefangimmillaro 649 167 282ms 13 Dec 2024 657th alexsave 648 111 9ms 13 Nov 2025 658th marcin7Cd 646 85 16ms 1 Jan 2021 658th aposteriorist 🇨🇦 646 85 11ms 28 Jan 2022 658th keelimeguy 🇺🇸 646 85 10ms 7 May 2025 661st dokutan 646 100 75ms 23 Jan 2026 662nd Shanethegamer 🇺🇸 645 125 2ms 24 Jan 2024 663rd boxjelly 644 121 120ms 5 Jan 2021 664th stefangimmillaro 644 143 156ms 29 Oct 2023 665th Yewzir 🇧🇪 643 112 12ms 20 Apr 2023 665th Mabeloid 🇳🇴 643 112 9ms 26 Oct 2024 667th postie77 642 133 384ms 5 May 2023 668th Natanaelel 🇸🇪 641 71 35ms 9 Aug 2021 668th olivermrose 🇺🇸 641 71 38ms 25 Sep 2021 668th error256 641 71 36ms 13 days ago 671st angel-p57 🇯🇵 641 196 1ms 23 Nov 2023 672nd h3ra993huskp 🇯🇵 640 154 369ms 30 Nov 2025 673rd edre 638 86 16ms 7 Jun 2018 674th adamnielson42 🇺🇸 638 99 6ms 20 Nov 2023 675th iznax 637 113 9ms 2 Jul 2020 675th Salutations45 637 113 8ms 22 Nov 2024 677th rvdnieuwendijk 🇳🇱 636 75 266ms 14 Jul 2020 678th dokutan 636 111 712ms 10 Dec 2025 679th HumanoidCPU 635 82 397ms 9 May 2025 679th fuzzylojik-golf 🇺🇸 635 82 387ms 5 days ago 681st MobDev-Hobby 634 41 39ms 9 Jan 2024 682nd mossr 🇺🇸 634 90 337ms 24 Feb 2021 683rd DialFrost 🇸🇬 634 99 4ms 8 Dec 2023 684th ovs-code 🇩🇪 634 102 3ms 7 Feb 2023 685th BrMorrison 634 123 122ms 6 Nov 2023 686th rifatx 633 135 369ms 6 Jul 2024 687th csharpython 632 72 35ms 28 Aug 2025 687th KatieLG 🇬🇧 632 72 37ms 7 Jan 2026 689th jeff-at-tamer-dot-codes 🇺🇸 631 87 11ms 6 Jun 2023 690th Shanethegamer 🇺🇸 631 124 36ms 13 Jun 2022 691st Steffan153 🇫🇮 631 199 2ms 19 Feb 2026 692nd KasperKivimaeki 🇫🇮 630 172 270ms 11 days ago 693rd SirBogman 🇺🇸 629 51 32ms 13 Nov 2022 694th prestosilver 🇺🇸 629 122 2ms 12 days ago 695th yanjs 629 124 117ms 23 Jan 2022 695th strout 629 124 121ms 17 Aug 2022 697th janbehrens 🇩🇪 629 145 62ms 20 Nov 2022 698th bobbogomip 628 61 3ms 7 Nov 2018 699th Meowsan91 🇨🇿 628 136 395ms 21 Nov 2021 700th annaproxy 627 83 482ms 21 Jan 2024 701st frobinsonj 626 115 10ms 28 Jun 2018 701st draxler-h 626 115 10ms 13 Jan 2023 701st xyangst 626 115 9ms 28 Sep 2024 701st LukeBridges 🇬🇧 626 115 14ms 1 Oct 2024 705th AlephSquirrel 626 142 41ms 21 Mar 2025 706th FlyingPenguin223 624 73 40ms 7 Nov 2023 706th DialFrost 🇸🇬 624 73 36ms 2 Jun 2024 706th Lv0Sys 🇵🇱 624 73 36ms 1 Dec 2025 706th D-MOVE 🇵🇭 624 73 38ms 23 Feb 2026 706th madex 🇩🇪 624 73 35ms 8 days ago 711th green-beans 624 88 9ms 30 Jan 2021 711th zacjl 624 88 16ms 20 Sep 2024 711th wh3n3v3r 🇨🇿 624 88 10ms 13 Nov 2024 711th JunkIce 624 88 10ms 19 Jan 2025 711th Bulmenisaurus 624 88 19ms 7 Jul 2025 716th janbehrens 🇩🇪 621 145 454ms 24 Mar 2022 717th jared-hughes 621 147 441ms 24 Jun 2022 718th didion0 🇺🇸 620 116 10ms 31 Jan 2022 718th fitzdotlol 🇺🇸 620 116 10ms 28 Mar 2022 720th Shanethegamer 🇺🇸 620 159 466ms 25 Sep 2025 First Prev 641–720 of 2,541 Next Last