The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 25 hours. Why not try and solve them ahead of time?
Topological Sort 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 241st Shanethegamer 🇺🇸 551 102 15ms 9 Aug 2025 242nd commandz0 🇺🇸 548 115 581ms 1 Sep 2025 243rd jared-hughes 548 151 19ms 13 Oct 2025 244th albanian-laundromat 548 183 132ms 30 Oct 2025 245th albanian-laundromat 545 563 55ms 20 days ago 246th Natanaelel 🇸🇪 544 128 131ms 21 Jul 2025 247th rucin93 🇵🇱 542 132 180ms 28 Feb 2026 248th AlephSquirrel 540 199 629ms 2 Aug 2025 249th weeble 540 204 63ms 22 Feb 2026 250th MeWhenI 🇻🇦 539 129 29ms 12 Jul 2025 250th BREMAUCY 🇫🇷 539 129 47ms 6 Aug 2025 252nd jerrandolph 538 344 300ms 20 Sep 2025 253rd davecame 535 130 21ms 9 Aug 2025 253rd RYNO8 535 130 84ms 6 Oct 2025 255th ovs-code 🇩🇪 535 139 640ms 8 days ago 256th Shanethegamer 🇺🇸 534 134 330ms 9 Aug 2025 257th aksyristos 531 131 38ms 3 days ago 258th tailorspy 530 282 3,092ms 12 Aug 2025 259th KatieLG 🇬🇧 529 104 82ms 2 Oct 2025 260th emgordon154 527 132 141ms 18 Nov 2025 260th Flekay 🇩🇪 527 132 19ms 25 days ago 262nd snoozingnewt 🇨🇦 523 337 302ms 23 Nov 2025 263rd jgbaldwinbrown 522 237 3ms 30 Jan 2026 264th emgordon154 521 121 851ms 18 Nov 2025 265th ahmetdemirag 🇨🇾 519 134 39ms 10 Aug 2025 265th btjones0 519 134 16ms 8 Sep 2025 265th StefanHabel 🇨🇦 519 134 16ms 22 Feb 2026 268th albanian-laundromat 519 288 1,575ms 20 days ago 269th AlephSquirrel 516 122 607ms 10 Jul 2025 270th DanielVenable 515 221 199ms 3 Aug 2025 271st SB-945 512 136 18ms 1 Aug 2025 272nd annaproxy 508 137 20ms 5 Sep 2025 272nd FortuiteMan 🇫🇷 508 137 19ms 25 Nov 2025 272nd Lv0Sys 🇵🇱 508 137 22ms 21 Feb 2026 275th madeforlosers 508 163 17ms 8 hours ago 276th Googolplexo 🇷🇺 501 139 16ms 2 days ago 277th andrewjc2000 497 140 17ms 2 Aug 2025 277th hiichbindermax 497 140 18ms 4 Aug 2025 279th MeWhenI 🇻🇦 492 128 614ms 16 Nov 2025 280th CaedenHarper 🇨🇦 487 143 16ms 3 Oct 2025 281st targrik 486 206 10ms 18 Aug 2025 282nd HumanoidCPU 483 144 24ms 12 Jan 2026 283rd weliveinhell 🇭🇹 481 172 15ms 23 Dec 2025 284th CaedenHarper 🇨🇦 478 387 316ms 17 Nov 2025 285th InigoK 🇺🇸 477 146 15ms 3 Sep 2025 285th scpchicken 🇵🇼 477 146 37ms 18 Jan 2026 287th voytxt 🇨🇿 477 519 1,539ms 25 Jul 2025 288th janAkali 🇷🇺 476 277 414ms 20 days ago 289th Mikey-Beep 🇬🇧 465 264 23ms 12 Aug 2025 290th Ripick 462 161 790ms 6 Aug 2025 291st YAJUE114514 461 151 17ms 1 Aug 2025 291st vgamula 🇺🇦 461 151 18ms 4 Aug 2025 293rd CaedenHarper 🇨🇦 453 139 416ms 3 Oct 2025 294th HumanoidCPU 450 140 482ms 12 Jan 2026 295th error256 446 189 190ms 7 Aug 2025 296th dokutan 443 157 15ms 28 Aug 2025 297th alemelis 440 158 17ms 2 Aug 2025 297th dirckvdende 440 158 17ms 4 Aug 2025 297th cros107 🇦🇺 440 158 15ms 12 Aug 2025 300th MeWhenI 🇻🇦 439 92 46ms 29 Nov 2025 301st h3ra993huskp 🇯🇵 439 341 743ms 30 Nov 2025 302nd iczelia 🇩🇪 433 263 208ms 19 Oct 2025 303rd LukeBridges 🇬🇧 431 192 15ms 19 Aug 2025 304th retrohun 430 94 1,094ms 1 Aug 2025 305th jatloe 430 162 17ms 1 Sep 2025 306th shelerr 427 163 1,637ms 21 Aug 2025 307th Program-Pi 422 196 13ms 21 days ago 308th DialFrost 🇸🇬 417 359 632ms 19 Nov 2025 309th madex 🇩🇪 413 427 263ms 2 Aug 2025 310th moustave 412 169 29ms 19 Aug 2025 311th MeWhenI 🇻🇦 411 170 2,292ms 15 Sep 2025 312th helbling 🇨🇭 408 203 15ms 8 Aug 2025 313th dokutan 404 156 431ms 14 Feb 2026 314th qpwoeirut 398 175 34ms 2 Aug 2025 315th dokutan 382 144 44ms 2 Aug 2025 316th jacekwladzinski 382 182 17ms 7 Oct 2025 317th alemelis 381 195 968ms 5 Aug 2025 318th luuumine 🇫🇷 380 183 16ms 21 Oct 2025 319th Lv0Sys 🇵🇱 379 145 46ms 12 Dec 2025 320th Mikey-Beep 🇬🇧 378 184 26ms 6 Aug 2025 First Prev 241–320 of 377 Next Last