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 bytes. 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 Bytes Time Submitted 241st GrayJoKing 🇦🇺 857 75 3ms 8 Nov 2020 242nd Shanethegamer 🇺🇸 857 77 1,308ms 24 Jan 2024 242nd FlyingPenguin223 857 77 1,257ms 22 Mar 2025 244th thospel 856 53 121ms 28 Jun 2018 245th o0lit3 🇺🇸 856 56 3ms 25 Sep 2020 245th kurkale6ka 856 56 3ms 3 Sep 2021 245th scpchicken 🇵🇼 856 56 3ms 4 Jan 2023 248th Jiramide 856 95 2ms 17 Oct 2020 248th FlyingPenguin223 856 95 2ms 7 Nov 2024 250th primo-ppcg 🇹🇭 856 104 6ms 8 Feb 2021 251st plcc0 855 105 2,605ms 14 days ago 252nd GrayJoKing 🇦🇺 854 77 16ms 9 Nov 2023 253rd primo-ppcg 🇹🇭 852 85 9ms 8 Nov 2019 254th ETHproductions 🇺🇸 850 68 314ms 26 Sep 2018 254th Shanethegamer 🇺🇸 850 68 465ms 10 Nov 2024 256th KasperKivimaeki 🇫🇮 850 91 2ms 11 days ago 257th Yewzir 🇧🇪 850 217 16ms 29 hours ago 258th primo-ppcg 🇹🇭 847 75 5ms 10 Jun 2018 259th jared-hughes 847 96 2ms 4 Jan 2023 260th SirBogman 🇺🇸 846 39 39ms 11 Nov 2022 260th T193R-W00D5 846 39 40ms 21 Apr 2025 262nd JayXon 🇺🇸 846 61 37ms 28 Dec 2021 262nd ovs-code 🇩🇪 846 61 36ms 9 May 2023 264th primo-ppcg 🇹🇭 846 80 3ms 1 Dec 2021 265th Steffan153 🇫🇮 845 98 3ms 16 Feb 2023 266th annaproxy 844 89 15ms 27 Oct 2023 267th stefangimmillaro 844 109 104ms 29 Sep 2022 268th primo-ppcg 🇹🇭 843 92 64ms 5 Apr 2025 269th GrayJoKing 🇦🇺 843 94 313ms 19 Jun 2022 270th m-tkach 🇺🇦 842 160 2ms 23 May 2025 271st Steffan153 🇫🇮 841 69 1ms 20 Jul 2024 272nd primo-ppcg 🇹🇭 840 92 1ms 30 Aug 2020 273rd marcin7Cd 840 106 6ms 7 Feb 2021 274th error256 839 107 2,646ms 13 days ago 275th janbehrens 🇩🇪 838 69 620ms 24 Feb 2022 276th sean-niemann 🇺🇸 838 130 266ms 12 Aug 2025 277th JayXon 🇺🇸 837 84 144ms 6 Jan 2026 278th WhoisDavid 837 111 128ms 1 Oct 2020 279th pardouin 🇫🇷 836 79 1,176ms 1 Sep 2025 280th primo-ppcg 🇹🇭 836 110 60ms 18 Jan 2022 281st bitsandbeyond 🇳🇱 834 58 256ms 24 Oct 2025 282nd pardouin 🇫🇷 832 62 35ms 1 Sep 2025 283rd duckyluuk 🇳🇱 832 79 10ms 28 Mar 2024 283rd BlankSpruce 832 79 9ms 28 Aug 2024 283rd Lv0Sys 🇵🇱 832 79 10ms 1 Dec 2025 286th GrayJoKing 🇦🇺 832 96 2ms 12 Sep 2022 287th albanian-laundromat 831 76 1,011ms 5 Nov 2025 288th 09cf 831 93 2ms 10 Nov 2023 289th GoateSo 830 98 2ms 17 Oct 2020 290th albanian-laundromat 830 105 4ms 14 Dec 2025 291st timvermeulen 829 112 140ms 4 Jan 2020 292nd kg583 🇺🇸 827 112 8ms 12 days ago 293rd ovs-code 🇩🇪 825 40 38ms 25 Feb 2025 294th GrayJoKing 🇦🇺 825 94 70ms 13 Sep 2024 295th Steffan153 🇫🇮 824 65 4ms 12 Feb 2026 296th emgordon154 824 121 110ms 4 Dec 2025 297th edsrzf 🇳🇿 823 109 2,583ms 14 days ago 298th SirBogman 🇺🇸 822 80 10ms 12 Nov 2022 299th edsrzf 🇳🇿 820 77 1,064ms 4 Dec 2025 300th bstrautin 819 59 264ms 17 Jun 2020 300th primo-ppcg 🇹🇭 819 59 261ms 18 Jun 2020 302nd primo-ppcg 🇹🇭 817 134 60ms 6 Mar 2022 303rd primo-ppcg 🇹🇭 816 165 2ms 2 Oct 2020 304th prplz 🇦🇺 814 95 2ms 29 Dec 2021 304th JohandeRuiter 🇳🇱 814 95 2ms 21 Oct 2023 306th Irratix 🇳🇱 813 89 10ms 15 Apr 2021 307th nwellnhof 🇩🇪 813 134 290ms 5 Sep 2020 308th ovs-code 🇩🇪 812 66 4ms 5 Oct 2024 309th GrayJoKing 🇦🇺 812 76 412ms 16 Jan 2024 310th ovs-code 🇩🇪 812 102 3ms 7 Feb 2023 311th laikoni 811 97 119ms 27 Dec 2018 312th primo-ppcg 🇹🇭 811 106 401ms 21 Nov 2021 313th Attero 🇸🇪 810 56 137ms 17 Oct 2020 314th SuperFola 809 228 46ms 4 days ago 315th lynn 808 93 9ms 16 Nov 2021 316th albanian-laundromat 806 99 3ms 15 Aug 2025 317th 09cf 806 114 451ms 17 Dec 2023 318th nwellnhof 🇩🇪 805 41 32ms 7 Sep 2021 318th Bubbler-4 805 41 3ms 19 Jan 2022 318th MobDev-Hobby 805 41 39ms 9 Jan 2024 First Prev 241–320 of 2,556 Next Last