The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 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 320th mbittner20 379 237 13ms 18 Aug 2025 320th HumanoidCPU 379 237 23ms 12 Jan 2026 323rd KatieLG 🇬🇧 376 153 92ms 18 Aug 2025 324th BambooleanLogic 🇸🇪 374 221 12ms 5 days ago 325th DialFrost 🇸🇬 362 248 15ms 10 Jul 2025 326th Shotokhan 359 250 14ms 24 Sep 2025 327th HumanoidCPU 358 220 681ms 12 Jan 2026 328th H3XDaemon 358 251 15ms 19 Aug 2025 329th madex 🇩🇪 352 351 3ms 18 Jan 2026 330th Babafaba 351 256 17ms 3 Nov 2025 331st gigaprofisi 🇺🇸 345 240 12ms 6 Aug 2025 332nd CaedenHarper 🇨🇦 344 203 1,426ms 27 Sep 2025 333rd MeWhenI 🇻🇦 343 193 1,467ms 25 Nov 2025 334th dokutan 342 263 14ms 26 Dec 2025 335th muser-logiccpu 🇺🇦 340 264 19ms 16 Aug 2025 335th jameswmccarty 340 264 14ms 14 Feb 2026 337th madeforlosers 334 248 14ms 25 Aug 2025 338th tomh1012 328 358 497ms 24 days ago 339th tomh1012 322 279 25ms 24 days ago 340th Babafaba 319 247 656ms 29 Oct 2025 341st DialFrost 🇸🇬 317 240 461ms 21 Dec 2025 342nd dokutan 311 253 619ms 28 Aug 2025 343rd Jacob385 300 500 451ms 1 Sep 2025 344th KatieLG 🇬🇧 299 586 175ms 2 Aug 2025 345th msbranicky 291 309 16ms 12 Aug 2025 346th luuumine 🇫🇷 289 311 16ms 10 Dec 2025 347th CaedenHarper 🇨🇦 287 288 14ms 29 Aug 2025 348th robin-scragg 275 327 17ms 13 Nov 2025 349th jediroberthatch 272 330 19ms 1 Aug 2025 350th aksyristos 267 337 18ms 20 days ago 351st nstearns96 🇬🇧 262 343 17ms 8 Aug 2025 352nd CaedenHarper 🇨🇦 261 574 492ms 2 days ago 353rd didion0 🇺🇸 251 330 23ms 29 Aug 2025 354th dokutan 246 234 41ms 2 Aug 2025 355th iczelia 🇩🇪 239 235 10ms 19 Oct 2025 356th CaedenHarper 🇨🇦 239 490 492ms 16 Oct 2025 357th ndren 239 2,498 1,785ms 27 Nov 2025 358th iczelia 🇩🇪 236 204 6ms 19 Oct 2025 359th JOrE20 219 834 89ms 13 Feb 2026 360th IISResetMe 215 332 1,466ms 9 Jan 2026 361st acollett89 193 429 13ms 12 Aug 2025 362nd codewrite 🇬🇧 185 634 490ms 12 Jan 2026 363rd dokutan 181 1,028 311ms 3 Aug 2025 364th iczelia 🇩🇪 177 575 16ms 19 Oct 2025 365th zakariamouhid 136 610 12ms 5 Sep 2025 366th Zhenyu-Bo 111 812 16ms 1 Aug 2025 367th AidanWalter 83 1,078 15ms 28 Nov 2025 368th 2bular 0 16 60ms 13 Jul 2025 368th saito-ta 🇯🇵 0 16 107ms 13 Jul 2025 370th aditsu 0 40 177ms 10 Aug 2025 371st ovs-code 🇩🇪 0 113 4ms 14 Jul 2025 372nd ovs-code 🇩🇪 0 121 20ms 14 Jul 2025 373rd Shanethegamer 🇺🇸 0 146 267ms 7 Aug 2025 374th aiwana 0 152 14ms 21 Oct 2025 375th edsrzf 🇳🇿 0 170 2,864ms 16 Aug 2025 376th dokutan 0 272 59ms 8 Feb 2026 First Prev 321–376 of 376