The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 23 hours. Why not try and solve them ahead of time?
Arrows 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 prplz 🇦🇺 665 163 687ms 25 Sep 2021 482nd galloj 🇨🇿 665 217 8ms 22 Apr 2024 483rd MeWhenI 🇻🇦 664 111 2,024ms 29 Aug 2025 483rd CaedenHarper 🇨🇦 664 111 1,989ms 16 Oct 2025 485th targrik 664 123 15ms 20 Mar 2025 486th jakobkordez 🇸🇮 663 109 43ms 28 Nov 2022 486th inventshah 663 109 14ms 20 Jul 2023 488th emgordon154 663 142 9ms 23 days ago 489th jerrandolph 661 183 356ms 20 Oct 2023 490th MeWhenI 🇻🇦 660 178 4ms 29 Apr 2022 491st dbkirk4211 659 124 11ms 3 May 2024 492nd MeWhenI 🇻🇦 658 100 378ms 14 Feb 2023 493rd MWI-polygolf 658 169 171ms 6 Dec 2023 494th klixel 🇨🇦 658 206 235ms 19 Jun 2023 495th primo-ppcg 🇹🇭 657 74 197ms 16 Sep 2021 495th scpchicken 🇵🇼 657 74 230ms 9 Jan 2023 497th targrik 657 121 7ms 27 Aug 2025 498th dokutan 657 149 10ms 1 Jul 2024 499th snoozingnewt 🇨🇦 656 185 3ms 10 Dec 2025 500th hemphen 655 136 465ms 30 Aug 2022 501st The3gs 655 207 174ms 28 Nov 2024 502nd sean-niemann 🇺🇸 653 98 2ms 23 Feb 2026 503rd Haksell 🇦🇶 652 88 36ms 22 Feb 2023 503rd olleicua 🇺🇸 652 88 38ms 15 Feb 2024 503rd emgordon154 652 88 48ms 4 Sep 2025 506th blaztoma 🇱🇹 650 182 171ms 1 Dec 2025 507th dokutan 649 125 2ms 6 Nov 2025 508th igmcdowell 648 126 15ms 14 Nov 2021 509th Shanethegamer 🇺🇸 647 117 19ms 9 Jul 2022 510th adoxography 645 89 48ms 28 Sep 2021 510th jared-hughes 645 89 37ms 12 Sep 2022 510th aaronze 🇦🇺 645 89 38ms 17 Sep 2023 510th denkyuu1 645 89 44ms 16 Feb 2026 514th davecame 645 112 12ms 31 Jul 2023 515th frosster 🇨🇦 645 144 2ms 19 Mar 2025 516th btjones0 645 210 258ms 8 Dec 2021 517th dokutan 642 131 3ms 5 Nov 2025 518th scpchicken 🇵🇼 642 211 221ms 6 Apr 2022 519th jared-hughes 639 113 13ms 22 Apr 2022 519th Artemis21 🇬🇧 639 113 14ms 10 Jan 2025 521st IanUtley 639 181 21ms 14 May 2024 522nd snoozingnewt 🇨🇦 637 201 7ms 9 Dec 2025 523rd Kanawanagasaki 636 140 419ms 15 Sep 2022 524th MeWhenI 🇻🇦 634 93 4ms 16 Apr 2023 525th ryyyn 🇺🇸 634 114 11ms 13 Jan 2026 526th eMGeeneer 634 171 648ms 26 Jun 2024 527th rgthree 633 129 13ms 6 Sep 2023 528th eMGeeneer 633 161 583ms 27 Jun 2024 529th the-zammers 632 234 157ms 15 Oct 2023 530th carotinoid 🇰🇷 628 115 24ms 8 days ago 531st KatieLG 🇬🇧 627 142 497ms 18 Oct 2022 532nd dokutan 627 246 2,205ms 5 Nov 2025 533rd dokutan 626 129 278ms 13 Dec 2025 534th Natanaelel 🇸🇪 624 131 14ms 27 Aug 2021 534th GeorgeStechman 🇬🇧 624 131 14ms 4 Dec 2023 534th HumanoidCPU 624 131 13ms 23 Nov 2025 537th bricknellj 623 116 11ms 27 Nov 2022 537th quimey 623 116 13ms 19 Jul 2023 539th snoozingnewt 🇨🇦 621 141 79ms 10 Dec 2025 540th c0d3-4-F00d 🇩🇪 619 132 13ms 22 Sep 2021 540th eranws 619 132 13ms 23 Dec 2024 542nd MeWhenI 🇻🇦 618 187 20ms 17 Nov 2021 543rd snoozingnewt 🇨🇦 617 93 37ms 10 Dec 2025 544th bizy-coder 617 117 10ms 10 Dec 2025 544th Lv0Sys 🇵🇱 617 117 11ms 20 Feb 2026 546th edsrzf 🇳🇿 617 119 6ms 18 Feb 2026 547th JRaspass 🇬🇧 615 96 4ms 26 Aug 2021 548th rucin93 🇵🇱 615 110 181ms 22 Jan 2025 549th zakariamouhid 614 133 11ms 22 Apr 2023 549th Protothor 614 133 11ms 10 days ago 551st SirBogman 🇺🇸 613 108 646ms 29 Jan 2024 551st Yewzir 🇧🇪 613 108 542ms 15 Feb 2024 553rd dokutan 612 400 1,925ms 15 Jan 2025 554th Shanethegamer 🇺🇸 611 160 9ms 24 Jan 2024 555th CaedenHarper 🇨🇦 611 182 104ms 7 Nov 2025 556th dcgjb 610 102 350ms 11 Jun 2024 557th Ralac07 🇦🇺 610 134 13ms 24 Nov 2025 558th strout 608 243 171ms 15 Aug 2022 559th slimer37 607 119 14ms 6 Dec 2025 560th janbehrens 🇩🇪 607 131 7ms 10 Jul 2023 First Prev 481–560 of 1,325 Next Last