The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 days. 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 commandz0 🇺🇸 548 115 581ms 1 Sep 2025 242nd jared-hughes 548 151 25ms 13 Oct 2025 243rd albanian-laundromat 548 183 132ms 30 Oct 2025 244th albanian-laundromat 545 563 55ms 17 days ago 245th Natanaelel 🇸🇪 544 128 131ms 21 Jul 2025 246th rucin93 🇵🇱 542 132 180ms 28 Feb 2026 247th AlephSquirrel 540 199 629ms 2 Aug 2025 248th weeble 540 204 63ms 22 Feb 2026 249th jerrandolph 540 344 300ms 20 Sep 2025 250th MeWhenI 🇻🇦 539 129 29ms 12 Jul 2025 250th BREMAUCY 🇫🇷 539 129 47ms 6 Aug 2025 252nd davecame 535 130 21ms 9 Aug 2025 252nd RYNO8 535 130 84ms 6 Oct 2025 254th ovs-code 🇩🇪 535 139 640ms 6 days ago 255th Shanethegamer 🇺🇸 534 134 330ms 9 Aug 2025 256th aksyristos 531 131 40ms 31 hours ago 257th tailorspy 530 282 3,092ms 12 Aug 2025 258th KatieLG 🇬🇧 529 104 82ms 2 Oct 2025 259th emgordon154 527 132 141ms 18 Nov 2025 259th Flekay 🇩🇪 527 132 19ms 23 days ago 261st snoozingnewt 🇨🇦 523 337 302ms 23 Nov 2025 262nd jgbaldwinbrown 522 237 3ms 30 Jan 2026 263rd emgordon154 521 121 851ms 18 Nov 2025 264th ahmetdemirag 🇨🇾 519 134 39ms 10 Aug 2025 264th btjones0 519 134 16ms 8 Sep 2025 264th StefanHabel 🇨🇦 519 134 16ms 22 Feb 2026 267th albanian-laundromat 519 288 1,575ms 17 days ago 268th AlephSquirrel 516 122 607ms 10 Jul 2025 269th DanielVenable 515 221 199ms 3 Aug 2025 270th SB-945 512 136 18ms 1 Aug 2025 271st annaproxy 508 137 20ms 5 Sep 2025 271st FortuiteMan 🇫🇷 508 137 19ms 25 Nov 2025 271st Lv0Sys 🇵🇱 508 137 22ms 21 Feb 2026 274th Googolplexo 🇷🇺 501 139 20ms 6 hours ago 275th andrewjc2000 497 140 17ms 2 Aug 2025 275th hiichbindermax 497 140 18ms 4 Aug 2025 277th MeWhenI 🇻🇦 492 128 614ms 16 Nov 2025 278th CaedenHarper 🇨🇦 487 143 16ms 3 Oct 2025 279th targrik 486 206 11ms 18 Aug 2025 280th HumanoidCPU 483 144 24ms 12 Jan 2026 281st weliveinhell 🇭🇹 481 172 15ms 23 Dec 2025 282nd CaedenHarper 🇨🇦 480 387 316ms 17 Nov 2025 283rd InigoK 🇺🇸 477 146 15ms 3 Sep 2025 283rd scpchicken 🇵🇼 477 146 37ms 18 Jan 2026 285th voytxt 🇨🇿 477 519 1,539ms 25 Jul 2025 286th janAkali 🇷🇺 476 277 414ms 18 days ago 287th Mikey-Beep 🇬🇧 465 264 23ms 12 Aug 2025 288th Ripick 462 161 790ms 6 Aug 2025 289th YAJUE114514 461 151 17ms 1 Aug 2025 289th vgamula 🇺🇦 461 151 18ms 4 Aug 2025 291st CaedenHarper 🇨🇦 453 139 416ms 3 Oct 2025 292nd HumanoidCPU 450 140 482ms 12 Jan 2026 293rd error256 446 189 190ms 7 Aug 2025 294th dokutan 443 157 15ms 28 Aug 2025 295th alemelis 440 158 17ms 2 Aug 2025 295th dirckvdende 440 158 17ms 4 Aug 2025 295th cros107 🇦🇺 440 158 15ms 12 Aug 2025 298th MeWhenI 🇻🇦 439 92 46ms 29 Nov 2025 299th h3ra993huskp 🇯🇵 439 341 743ms 30 Nov 2025 300th iczelia 🇩🇪 433 263 208ms 19 Oct 2025 301st LukeBridges 🇬🇧 431 192 16ms 19 Aug 2025 302nd retrohun 430 94 1,094ms 1 Aug 2025 303rd jatloe 430 162 17ms 1 Sep 2025 304th shelerr 427 163 1,637ms 21 Aug 2025 305th Program-Pi 422 196 14ms 19 days ago 306th DialFrost 🇸🇬 417 359 632ms 19 Nov 2025 307th madex 🇩🇪 413 427 263ms 2 Aug 2025 308th moustave 412 169 29ms 19 Aug 2025 309th MeWhenI 🇻🇦 411 170 1,277ms 15 Sep 2025 310th helbling 🇨🇭 408 203 20ms 8 Aug 2025 311th dokutan 404 156 431ms 14 Feb 2026 312th qpwoeirut 398 175 34ms 2 Aug 2025 313th dokutan 382 144 44ms 2 Aug 2025 314th jacekwladzinski 382 182 17ms 7 Oct 2025 315th alemelis 381 195 968ms 5 Aug 2025 316th luuumine 🇫🇷 380 183 16ms 21 Oct 2025 317th Lv0Sys 🇵🇱 379 145 46ms 12 Dec 2025 318th Mikey-Beep 🇬🇧 378 184 26ms 6 Aug 2025 319th BambooleanLogic 🇸🇪 374 221 13ms 10 days ago 320th Artemis21 🇬🇧 372 187 81ms 6 Dec 2025 First Prev 241–320 of 376 Next Last