The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 42 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 SB-945 623 101 10ms 12 Apr 2024 481st edsrzf 🇳🇿 623 101 11ms 9 Dec 2025 483rd GrayJoKing 🇦🇺 622 86 35ms 28 Jan 2022 483rd olivermrose 🇺🇸 622 86 39ms 7 Feb 2022 485th Yewzir 🇧🇪 622 178 101ms 23 Mar 2024 486th ovs-code 🇩🇪 622 242 7ms 16 Mar 2023 487th emgordon154 621 110 146ms 16 Nov 2024 488th stefangimmillaro 619 142 40ms 26 Apr 2025 489th bzijlema 🇳🇱 619 208 288ms 30 Jan 2024 490th alemelis 617 99 1,041ms 3 Apr 2023 491st GolfingSuccess 🇬🇷 617 102 10ms 2 Jun 2022 491st bizy-coder 617 102 9ms 27 Jun 2025 491st MeWhenI 🇻🇦 617 102 11ms 19 Dec 2025 494th dokutan 616 159 2ms 27 Mar 2024 495th edsrzf 🇳🇿 615 49 3ms 10 days ago 496th Natanaelel 🇸🇪 615 87 37ms 26 Jan 2022 497th stefangimmillaro 615 156 2,667ms 11 Nov 2024 498th error256 614 136 8ms 23 Dec 2024 499th 5cw 🇺🇸 611 103 10ms 29 May 2025 500th dokutan 611 157 2,491ms 24 Oct 2024 501st Shanethegamer 🇺🇸 610 162 116ms 17 Oct 2022 502nd blaztoma 🇱🇹 609 65 37ms 26 days ago 503rd Maznek 609 133 9ms 3 Jul 2023 504th edsrzf 🇳🇿 609 137 7ms 11 Dec 2025 505th MeWhenI 🇻🇦 607 183 66ms 26 May 2023 506th postie77 606 168 390ms 27 Feb 2023 506th amazingalek 🇳🇴 606 168 477ms 5 Jan 2026 508th bizy-coder 605 100 534ms 17 Jan 2024 509th jakobkordez 🇸🇮 605 104 17ms 8 Nov 2022 509th krisktopher 605 104 10ms 15 Nov 2023 509th albanian-laundromat 605 104 23ms 19 Aug 2025 512th MeWhenI 🇻🇦 605 134 10ms 1 Mar 2022 513th MeWhenI 🇻🇦 605 176 1,329ms 8 Jun 2023 514th MeWhenI 🇻🇦 603 185 392ms 15 Nov 2022 515th albanian-laundromat 602 126 1,149ms 16 Sep 2025 516th KrausRaus 🇺🇸 602 147 5ms 7 Sep 2022 517th snoozingnewt 🇨🇦 598 99 77ms 29 Nov 2025 517th emgordon154 598 99 80ms 14 days ago 519th sisyphus-ppcg 🇦🇺 598 148 5ms 23 Nov 2022 520th ovs-code 🇩🇪 594 90 36ms 11 Mar 2024 521st IanUtley 594 169 17ms 2 Apr 2024 522nd janbehrens 🇩🇪 594 190 453ms 24 Mar 2022 523rd GolfingSuccess 🇬🇷 593 102 431ms 15 Jan 2024 523rd m-tkach 🇺🇦 593 102 518ms 20 Jan 2024 525th bzijlema 🇳🇱 593 106 10ms 28 Jan 2025 526th MeWhenI 🇻🇦 592 160 156ms 16 Nov 2022 527th KatieLG 🇬🇧 591 137 10ms 5 Oct 2025 528th primo-ppcg 🇹🇭 591 197 441ms 16 Mar 2022 529th janbehrens 🇩🇪 589 143 14ms 2 Jul 2023 530th emgordon154 588 91 36ms 25 Sep 2025 531st neel11235813 588 103 480ms 27 Mar 2024 532nd jared-hughes 588 107 10ms 27 May 2022 532nd AlephSquirrel 588 107 9ms 17 Jan 2023 532nd StefanHabel 🇨🇦 588 107 9ms 20 Sep 2023 532nd commandz0 🇺🇸 588 107 10ms 4 Sep 2025 536th dokutan 588 156 4ms 1 Apr 2024 537th MeWhenI 🇻🇦 588 173 416ms 26 Jul 2023 538th BlankSpruce 584 153 2ms 7 Aug 2024 539th albanian-laundromat 582 104 422ms 12 Sep 2025 540th dokutan 582 152 5ms 13 Apr 2024 541st scpchicken 🇵🇼 581 92 34ms 19 Jan 2023 542nd MeWhenI 🇻🇦 581 124 274ms 29 Jan 2023 543rd dokutan 581 133 74ms 23 Jan 2026 544th annaproxy 580 173 16ms 4 Jan 2023 545th didion0 🇺🇸 579 140 10ms 19 Apr 2022 546th MeWhenI 🇻🇦 579 191 110ms 16 Mar 2022 547th commandz0 🇺🇸 577 105 441ms 4 Sep 2025 548th Natanaelel 🇸🇪 577 109 14ms 27 Jan 2022 548th inventshah 577 109 9ms 16 Nov 2022 550th BloodStormKnight 575 141 9ms 15 Oct 2022 551st varhammer 575 172 5ms 13 Dec 2023 552nd MichalMarsalek 🇨🇿 575 194 404ms 26 Jan 2022 553rd MeWhenI 🇻🇦 575 197 28ms 6 Jun 2023 554th MeWhenI 🇻🇦 574 160 4ms 23 May 2023 555th KasperKivimaeki 🇫🇮 572 110 10ms 4 Dec 2025 556th elephantpanda 572 232 35ms 10 Aug 2022 557th MeWhenI 🇻🇦 572 260 2ms 20 Apr 2022 558th Yewzir 🇧🇪 570 161 4ms 14 May 2023 559th MeWhenI 🇻🇦 568 188 110ms 16 Oct 2022 560th michaelmoynihan 567 111 9ms 5 Jan 2026 First Prev 481–560 of 1,777 Next Last