The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
Topological Sort in all languages in bytes. 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 Bytes Time Submitted 241st error256 617 189 190ms 7 Aug 2025 242nd InigoK 🇺🇸 616 146 15ms 3 Sep 2025 242nd scpchicken 🇵🇼 616 146 37ms 18 Jan 2026 244th MeWhenI 🇻🇦 615 128 614ms 16 Nov 2025 245th KatieLG 🇬🇧 607 148 54ms 7 Jan 2026 246th Shanethegamer 🇺🇸 606 156 3,585ms 10 Aug 2025 247th YAJUE114514 595 151 17ms 1 Aug 2025 247th vgamula 🇺🇦 595 151 18ms 4 Aug 2025 247th anter69 🇭🇺 595 151 37ms 27 Aug 2025 250th JOrE20 591 140 21ms 31 Jan 2026 251st SirBogman 🇺🇸 587 79 38ms 8 Aug 2025 252nd alexsave 583 142 12ms 11 Jan 2026 253rd albanian-laundromat 583 226 605ms 22 Aug 2025 254th MeWhenI 🇻🇦 580 50 100ms 30 Jul 2025 254th emgordon154 580 50 963ms 6 Nov 2025 256th albanian-laundromat 572 178 101ms 16 Oct 2025 257th SirBogman 🇺🇸 569 51 6ms 5 Aug 2025 258th alemelis 569 158 17ms 2 Aug 2025 258th dirckvdende 569 158 17ms 4 Aug 2025 258th cros107 🇦🇺 569 158 15ms 12 Aug 2025 261st CLOStrophobic 🇮🇹 568 189 50ms 24 Dec 2025 262nd CaedenHarper 🇨🇦 566 139 416ms 3 Oct 2025 263rd FEZfan 🇦🇺 562 160 30ms 11 Jul 2025 264th aiwana 562 469 395ms 25 Oct 2025 265th CatsAreFluffy 561 93 51ms 30 Oct 2025 266th Yax42 🇫🇷 559 148 299ms 20 Jan 2026 267th jatloe 555 162 17ms 1 Sep 2025 268th olleicua 🇺🇸 554 104 42ms 5 Aug 2025 269th Shanethegamer 🇺🇸 551 102 15ms 9 Aug 2025 270th shelerr 551 163 1,637ms 21 Aug 2025 271st ovs-code 🇩🇪 550 141 640ms 3 days ago 272nd jared-hughes 548 151 25ms 13 Oct 2025 273rd albanian-laundromat 548 183 132ms 30 Oct 2025 274th albanian-laundromat 545 563 55ms 15 days ago 275th AlephSquirrel 540 199 629ms 2 Aug 2025 276th weeble 540 204 63ms 22 Feb 2026 277th jerrandolph 540 344 300ms 20 Sep 2025 278th moustave 532 169 29ms 19 Aug 2025 279th tailorspy 530 282 3,092ms 12 Aug 2025 280th KatieLG 🇬🇧 528 149 674ms 22 Sep 2025 281st snoozingnewt 🇨🇦 523 337 280ms 23 Nov 2025 282nd jgbaldwinbrown 522 237 3ms 30 Jan 2026 283rd albanian-laundromat 519 288 1,575ms 15 days ago 284th yjgnaw 516 174 22ms 24 Jul 2025 285th DanielVenable 515 221 199ms 3 Aug 2025 286th qpwoeirut 514 175 34ms 2 Aug 2025 287th jacekwladzinski 494 182 17ms 7 Oct 2025 288th RaBa21 🇭🇺 488 184 18ms 3 Aug 2025 288th Mikey-Beep 🇬🇧 488 184 26ms 6 Aug 2025 290th albanian-laundromat 487 209 103ms 29 Sep 2025 291st targrik 486 206 11ms 18 Aug 2025 292nd Ripick 482 161 790ms 6 Aug 2025 293rd weliveinhell 🇭🇹 481 172 15ms 23 Dec 2025 294th Artemis21 🇬🇧 481 187 81ms 6 Dec 2025 295th CaedenHarper 🇨🇦 480 387 316ms 17 Nov 2025 296th voytxt 🇨🇿 477 519 1,642ms 25 Jul 2025 297th janAkali 🇷🇺 476 277 414ms 16 days ago 298th Mikey-Beep 🇬🇧 465 264 23ms 12 Aug 2025 299th OllieBoyne 🇬🇧 449 200 16ms 11 Dec 2025 300th madex 🇩🇪 445 202 18ms 18 Jan 2026 301st guilhem-roy 🇫🇷 443 203 17ms 22 Nov 2025 302nd MeWhenI 🇻🇦 439 92 46ms 29 Nov 2025 303rd h3ra993huskp 🇯🇵 439 341 743ms 30 Nov 2025 304th iczelia 🇩🇪 433 263 208ms 19 Oct 2025 305th Bulmenisaurus 432 208 114ms 26 Oct 2025 306th LukeBridges 🇬🇧 431 192 16ms 19 Aug 2025 307th retrohun 430 94 1,094ms 1 Aug 2025 308th klixel 🇨🇦 430 209 18ms 15 Jan 2026 309th RobertBurs 424 212 17ms 24 Sep 2025 310th Program-Pi 422 196 14ms 17 days ago 311th tatzyr 🇯🇵 417 138 42ms 12 Aug 2025 312th DialFrost 🇸🇬 417 359 632ms 19 Nov 2025 313th madex 🇩🇪 413 427 255ms 2 Aug 2025 314th MeWhenI 🇻🇦 411 170 1,277ms 15 Sep 2025 315th CatsAreFluffy 410 219 21ms 30 Oct 2025 316th helbling 🇨🇭 408 203 20ms 8 Aug 2025 317th SB-945 405 222 18ms 1 Aug 2025 318th alemelis 398 195 968ms 5 Aug 2025 319th Lv0Sys 🇵🇱 397 145 46ms 12 Dec 2025 320th emgordon154 379 152 41ms 18 Nov 2025 First Prev 241–320 of 377 Next Last