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 876th cardosoo 560 98 10ms 6 Oct 2024 876th andrewjc2000 560 98 9ms 2 Jul 2025 876th Nhan-TRANvan_keyloop 560 98 10ms 20 Aug 2025 876th countlpaul-dotcom 560 98 10ms 19 Oct 2025 885th neihousaigaai 560 176 404ms 30 Apr 2021 886th SpareManiKatti 558 129 10ms 13 Oct 2021 886th Nico-Kasz 558 129 9ms 19 Apr 2022 886th adamnielson42 🇺🇸 558 129 12ms 25 Apr 2023 889th Kloppermand 🇩🇰 558 153 368ms 6 Jan 2023 890th marcin7Cd 558 225 2ms 31 Aug 2019 891st benson-z 557 177 405ms 1 Sep 2023 892nd c0d3-4-F00d 🇩🇪 556 138 1ms 8 Feb 2022 893rd Waffle3z 555 82 34ms 17 Oct 2020 893rd AgentIvan 🇺🇦 555 82 37ms 28 Jan 2021 895th drew-loukusa 555 99 10ms 26 May 2020 895th Secozzi 555 99 11ms 20 Oct 2020 895th seanshpark 555 99 10ms 18 Dec 2020 895th soalyer 555 99 9ms 9 Nov 2021 895th CodyMiner 555 99 10ms 14 Nov 2021 895th MichalMarsalek 🇨🇿 555 99 9ms 23 Oct 2022 895th logvp 555 99 10ms 6 Oct 2024 895th BREMAUCY 🇫🇷 555 99 10ms 7 Aug 2025 895th cros107 🇦🇺 555 99 10ms 2 Jan 2026 895th Pyroan 555 99 10ms 5 Jan 2026 905th juliansiebert 🇩🇪 554 86 226ms 23 Jul 2022 905th krcs 🇵🇱 554 86 250ms 15 Oct 2024 907th FEZfan 🇦🇺 554 94 561ms 26 Apr 2025 908th shuding 554 130 10ms 6 May 2020 908th dokutan 554 130 10ms 20 Apr 2025 910th MeWhenI 🇻🇦 553 58 3ms 4 Feb 2022 911th Shanethegamer 🇺🇸 553 95 4ms 16 Aug 2024 912th PiterAnnema 549 100 10ms 23 Mar 2022 912th neihousaigaai 549 100 10ms 17 Apr 2022 912th Heathcorp 🇦🇺 549 100 12ms 2 Dec 2022 912th aksyristos 549 100 9ms 2 Feb 2023 912th madex 🇩🇪 549 100 10ms 9 Jul 2024 912th evan18c 549 100 10ms 22 Apr 2025 912th LvLError 549 100 10ms 29 May 2025 912th vgamula 🇺🇦 549 100 10ms 5 Aug 2025 920th Yewzir 🇧🇪 547 144 117ms 28 Mar 2024 921st joelgduggan 547 156 405ms 21 Nov 2021 922nd mcreenan 546 67 145ms 20 Jun 2018 923rd Irratix 🇳🇱 546 167 418ms 3 Jan 2022 924th Natanaelel 🇸🇪 545 132 9ms 11 May 2022 924th CallanMcNulty 545 132 11ms 30 Sep 2022 924th aksyristos 545 132 11ms 28 Dec 2022 927th Andriamanitra 🇫🇮 545 156 4ms 13 Jun 2024 928th klixel 🇨🇦 545 169 146ms 9 Jun 2023 929th NewDefectus 🇮🇱 544 101 10ms 21 Apr 2021 929th eddvrs 544 101 9ms 20 Aug 2022 929th commandz0 🇺🇸 544 101 10ms 29 Sep 2022 929th benson-z 544 101 10ms 6 Dec 2024 933rd Herbert00709 🇵🇱 544 141 2ms 8 Jun 2024 934th aliakseikalosha 544 157 393ms 22 Oct 2024 935th akusumoto 🇯🇵 542 170 153ms 6 Apr 2022 936th vibdev 541 133 10ms 26 Aug 2021 937th Jandoife 541 142 2ms 9 Dec 2022 938th Ashray-g 🇺🇸 541 182 393ms 1 Sep 2023 939th Shanethegamer 🇺🇸 540 158 376ms 9 Apr 2025 940th scpchicken 🇵🇼 538 102 10ms 26 Mar 2022 940th mdnestor 538 102 11ms 27 Dec 2022 940th FranklinJiaChen 538 102 9ms 19 Jul 2024 940th BoBz200 538 102 10ms 9 Nov 2024 940th FortuiteMan 🇫🇷 538 102 10ms 3 Dec 2025 945th eranws 537 134 11ms 16 Oct 2022 945th bremersj 537 134 10ms 24 Oct 2025 947th n8pjl 537 143 2ms 29 Oct 2023 948th arctouch-cristiannevianna 537 159 392ms 4 Mar 2024 949th MeWhenI 🇻🇦 537 170 440ms 14 Nov 2022 950th KevinMarquette 🇺🇸 536 89 257ms 5 Jun 2020 950th TimCurwick 🇺🇸 536 89 265ms 27 Jan 2021 950th JPRuskin 🇬🇧 536 89 264ms 1 May 2024 953rd MichalMarsalek 🇨🇿 536 97 458ms 21 Jan 2024 954th mousetail 🇳🇱 536 118 5ms 22 Oct 2024 955th dokutan 536 168 480ms 27 Dec 2025 956th JOrE20 535 203 60ms 9 Feb 2026 957th bizy-coder 535 235 2ms 20 Jan 2024 958th ericlangedijk 🇸🇮 534 160 388ms 22 May 2023 959th aalanso 534 171 2,884ms 18 Nov 2023 960th P-Quentin 🇫🇷 533 103 10ms 11 Aug 2022 First Prev 881–960 of 2,541 Next Last