The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 hours. Why not try and solve them ahead of time?
Number Spiral 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 481st hemphen 636 160 412ms 6 Aug 2022 482nd emgordon154 636 234 4ms 21 Oct 2025 483rd Flekay 🇩🇪 635 99 9ms 15 Feb 2026 484th plcc0 635 119 80ms 29 hours ago 485th MeWhenI 🇻🇦 630 179 448ms 4 Mar 2022 486th ryyyn 🇺🇸 629 100 10ms 15 Dec 2025 487th MeWhenI 🇻🇦 629 185 495ms 7 Nov 2025 488th KenanSi 628 48 2ms 24 Feb 2022 489th Yax42 🇫🇷 628 129 9ms 20 Jan 2026 490th Yewzir 🇧🇪 628 162 374ms 30 Dec 2023 491st tobeannouncd 626 158 120ms 10 Jan 2024 492nd lynn 625 241 6ms 16 Mar 2023 493rd namelessiw 624 97 424ms 10 Apr 2024 494th DialFrost 🇸🇬 624 117 1ms 21 Dec 2024 495th SB-945 623 101 10ms 12 Apr 2024 496th GrayJoKing 🇦🇺 622 86 35ms 28 Jan 2022 496th olivermrose 🇺🇸 622 86 39ms 7 Feb 2022 498th Yewzir 🇧🇪 622 178 99ms 23 Mar 2024 499th ovs-code 🇩🇪 622 242 7ms 16 Mar 2023 500th emgordon154 621 110 146ms 16 Nov 2024 501st stefangimmillaro 619 142 40ms 26 Apr 2025 502nd bzijlema 🇳🇱 619 208 288ms 30 Jan 2024 503rd alemelis 617 99 1,041ms 3 Apr 2023 504th GolfingSuccess 🇬🇷 617 102 10ms 2 Jun 2022 504th bizy-coder 617 102 9ms 27 Jun 2025 504th MeWhenI 🇻🇦 617 102 11ms 19 Dec 2025 507th dokutan 616 159 2ms 27 Mar 2024 508th Natanaelel 🇸🇪 615 87 37ms 26 Jan 2022 509th stefangimmillaro 615 156 2,667ms 11 Nov 2024 510th 5cw 🇺🇸 611 103 10ms 29 May 2025 511th dokutan 611 157 2,491ms 24 Oct 2024 512th Shanethegamer 🇺🇸 610 162 116ms 17 Oct 2022 513th blaztoma 🇱🇹 609 65 37ms 3 Mar 2026 514th Maznek 609 133 9ms 3 Jul 2023 515th error256 608 136 8ms 23 Dec 2024 516th MeWhenI 🇻🇦 608 183 66ms 26 May 2023 517th postie77 606 168 390ms 27 Feb 2023 517th amazingalek 🇳🇴 606 168 477ms 5 Jan 2026 519th bizy-coder 605 100 534ms 17 Jan 2024 520th jakobkordez 🇸🇮 605 104 17ms 8 Nov 2022 520th krisktopher 605 104 10ms 15 Nov 2023 520th albanian-laundromat 605 104 23ms 19 Aug 2025 523rd MeWhenI 🇻🇦 605 134 10ms 1 Mar 2022 524th MeWhenI 🇻🇦 605 176 1,329ms 8 Jun 2023 525th MeWhenI 🇻🇦 604 185 392ms 15 Nov 2022 526th albanian-laundromat 602 126 1,215ms 16 Sep 2025 527th KrausRaus 🇺🇸 602 147 5ms 7 Sep 2022 528th snoozingnewt 🇨🇦 598 99 77ms 29 Nov 2025 528th emgordon154 598 99 80ms 15 days ago 530th sisyphus-ppcg 🇦🇺 598 148 5ms 23 Nov 2022 531st ovs-code 🇩🇪 594 90 36ms 11 Mar 2024 532nd IanUtley 594 169 17ms 2 Apr 2024 533rd janbehrens 🇩🇪 594 190 453ms 24 Mar 2022 534th GolfingSuccess 🇬🇷 593 102 431ms 15 Jan 2024 534th m-tkach 🇺🇦 593 102 518ms 20 Jan 2024 536th bzijlema 🇳🇱 593 106 10ms 28 Jan 2025 537th MeWhenI 🇻🇦 592 160 156ms 16 Nov 2022 538th KatieLG 🇬🇧 591 137 9ms 5 Oct 2025 539th primo-ppcg 🇹🇭 591 197 441ms 16 Mar 2022 540th janbehrens 🇩🇪 589 143 14ms 2 Jul 2023 541st emgordon154 588 91 36ms 25 Sep 2025 542nd neel11235813 588 103 480ms 27 Mar 2024 543rd jared-hughes 588 107 10ms 27 May 2022 543rd AlephSquirrel 588 107 9ms 17 Jan 2023 543rd StefanHabel 🇨🇦 588 107 9ms 20 Sep 2023 543rd commandz0 🇺🇸 588 107 10ms 4 Sep 2025 547th dokutan 588 156 4ms 1 Apr 2024 548th MeWhenI 🇻🇦 588 173 416ms 26 Jul 2023 549th BlankSpruce 585 153 2ms 7 Aug 2024 550th albanian-laundromat 582 104 422ms 12 Sep 2025 551st dokutan 582 152 5ms 13 Apr 2024 552nd scpchicken 🇵🇼 581 92 34ms 19 Jan 2023 553rd MeWhenI 🇻🇦 581 124 274ms 29 Jan 2023 554th annaproxy 580 173 16ms 4 Jan 2023 555th didion0 🇺🇸 579 140 9ms 19 Apr 2022 556th MeWhenI 🇻🇦 579 191 98ms 16 Mar 2022 557th commandz0 🇺🇸 577 105 441ms 4 Sep 2025 558th Natanaelel 🇸🇪 577 109 14ms 27 Jan 2022 558th inventshah 577 109 9ms 16 Nov 2022 560th MichalMarsalek 🇨🇿 576 194 404ms 26 Jan 2022 First Prev 481–560 of 1,816 Next Last