The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?
ASCII Table 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 MeWhenI 🇻🇦 774 325 9ms 1 Aug 2023 482nd primo-ppcg 🇹🇭 773 108 6ms 30 Mar 2022 483rd KasperKivimaeki 🇫🇮 772 114 4ms 12 Dec 2025 484th Salutations45 772 126 1ms 16 Jan 2025 485th CarsonChr 🇺🇸 772 172 132ms 11 Jul 2024 486th albanian-laundromat 771 130 3ms 31 Dec 2025 487th Yewzir 🇧🇪 770 128 159ms 14 Sep 2023 488th YuryChaikou-ServiceNow 770 156 390ms 27 Oct 2022 488th h45h74x 770 156 377ms 5 Nov 2025 490th Alex-x90 🇺🇸 769 88 10ms 14 Oct 2022 491st pilaf 🇦🇷 769 107 1,397ms 5 Apr 2022 491st Shanethegamer 🇺🇸 769 107 1,393ms 21 Mar 2023 493rd janbehrens 🇩🇪 769 154 479ms 16 Nov 2022 494th Attero 🇸🇪 768 127 1ms 3 Aug 2022 494th janbehrens 🇩🇪 768 127 2ms 16 Nov 2022 494th roupiq 🇵🇱 768 127 1ms 24 Feb 2024 497th error256 767 116 7ms 13 days ago 498th Yewzir 🇧🇪 767 135 7ms 4 Jan 2025 499th rotary-o 🇯🇵 767 166 387ms 4 May 2023 500th Shanethegamer 🇺🇸 767 173 119ms 15 Oct 2022 501st SirBogman 🇺🇸 767 328 10ms 27 Mar 2022 502nd Shanethegamer 🇺🇸 765 146 118ms 21 Mar 2023 503rd memiamp 🇬🇧 765 157 412ms 19 Oct 2022 504th rowan-OzRunways 765 169 707ms 19 Jul 2023 505th blaztoma 🇱🇹 764 197 26ms 5 Jan 2026 506th annaproxy 763 155 70ms 3 Jan 2023 507th dokutan 763 167 480ms 24 Sep 2025 507th edsrzf 🇳🇿 763 167 3ms 6 days ago 509th J00LZ 763 174 131ms 5 May 2022 509th CSRessel 763 174 147ms 13 Sep 2025 511th DestyNova 🇮🇪 762 108 1,465ms 14 Aug 2022 512th MeWhenI 🇻🇦 762 128 2ms 27 Mar 2022 512th NewDefectus 🇮🇱 762 128 1ms 2 Apr 2022 512th Romain-1 🇫🇷 762 128 1ms 2 May 2022 512th ListeriaM 762 128 2ms 20 Aug 2023 516th Yewzir 🇧🇪 762 186 302ms 7 Feb 2024 517th andersk 🇺🇸 761 89 11ms 8 Nov 2022 518th DialFrost 🇸🇬 761 120 1ms 29 Jan 2024 519th jared-hughes 761 146 2ms 27 Mar 2022 519th Mabeloid 🇳🇴 761 146 1ms 21 Sep 2024 521st snoozingnewt 🇨🇦 760 149 110ms 21 days ago 522nd LS2021 760 158 424ms 29 Nov 2023 522nd TRexOnGit 760 158 420ms 30 Jan 2024 524th janbehrens 🇩🇪 759 116 4ms 3 Jul 2023 524th emplv 🇱🇻 759 116 5ms 4 Jun 2025 526th MeWhenI 🇻🇦 759 156 457ms 17 Apr 2024 527th emgordon154 758 105 129ms 6 Sep 2024 528th Yewzir 🇧🇪 758 129 11ms 19 Apr 2023 528th Michiocre 758 129 10ms 19 Mar 2024 528th Steffan153 🇫🇮 758 129 11ms 10 Jun 2024 531st Shanethegamer 🇺🇸 758 130 163ms 1 May 2023 532nd Ripick 758 143 120ms 4 Feb 2023 533rd Shanethegamer 🇺🇸 758 168 472ms 25 Sep 2025 534th martin-viggiano 758 187 285ms 22 Jun 2022 534th MCausc78 🇺🇦 758 187 326ms 30 Dec 2022 536th prestosilver 🇺🇸 756 129 2ms 13 Nov 2025 537th lynn 756 215 1ms 16 May 2022 538th IanUtley 755 184 2ms 2 Jul 2024 539th lynn 754 86 457ms 17 Feb 2024 539th PeterTillema 🇳🇱 754 86 470ms 11 Mar 2024 539th m-tkach 🇺🇦 754 86 428ms 31 Mar 2024 542nd emgordon154 754 206 1,524ms 29 May 2025 543rd SB-945 752 90 10ms 17 Apr 2024 543rd luuumine 🇫🇷 752 90 17ms 13 Oct 2025 543rd carotinoid 🇰🇷 752 90 10ms 8 days ago 546th juliansiebert 🇩🇪 751 91 273ms 2 Dec 2023 547th nwellnhof 🇩🇪 750 82 36ms 3 Jun 2022 548th strout 750 149 125ms 21 Aug 2022 549th trvswgnr 750 177 130ms 29 Apr 2023 550th dokutan 748 130 1ms 28 Apr 2025 551st sisyphus-ppcg 🇦🇺 747 59 39ms 16 Feb 2023 551st ovs-code 🇩🇪 747 59 38ms 18 Jul 2024 553rd Shanethegamer 🇺🇸 746 130 2,590ms 28 Oct 2024 554th dokutan 746 169 2ms 5 Aug 2024 555th c0d3-4-F00d 🇩🇪 745 131 2ms 28 Mar 2022 555th Natanaelel 🇸🇪 745 131 1ms 26 May 2022 555th User2654 745 131 1ms 10 Feb 2023 555th Shanethegamer 🇺🇸 745 131 1ms 21 Mar 2023 555th BlankSpruce 745 131 2ms 17 Aug 2024 560th rucin93 🇵🇱 745 171 374ms 24 Sep 2025 First Prev 481–560 of 2,312 Next Last