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?
brainfuck 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 881st YellowBunnyGit 456 227 2ms 3 Jan 2021 882nd frederikb 454 389 646ms 7 Sep 2020 883rd rvdnieuwendijk 🇳🇱 453 184 433ms 15 Oct 2020 884th mathisfun271 453 225 21ms 12 Feb 2024 884th edsrzf 🇳🇿 453 225 22ms 22 Jan 2025 884th itljan30 453 225 21ms 26 Jan 2025 884th YAJUE114514 453 225 23ms 21 days ago 888th Sora1248 🇩🇪 452 229 2ms 18 Feb 2023 888th not-a-pokemon 452 229 2ms 30 Jul 2025 890th mossprescott 451 226 22ms 10 Jan 2023 891st Schmitt-Very-Cool 451 392 542ms 26 Sep 2025 892nd klixel 🇨🇦 450 230 2ms 15 Nov 2024 893rd NickTheEASDude 🇺🇸 449 227 22ms 19 Dec 2023 894th jorbDehmel 🇺🇸 449 294 73ms 18 May 2023 895th JOrE20 449 485 4ms 16 Dec 2025 896th ncm 448 231 2ms 7 Sep 2020 897th Kauhentus 448 238 15ms 7 Dec 2019 898th jarekwg 447 228 23ms 26 Apr 2019 898th cingulataluke 447 228 20ms 27 Aug 2023 900th EchoedWords 447 320 213ms 10 Feb 2026 901st emgordon154 445 136 43ms 14 May 2025 902nd Ripick 445 229 23ms 1 Feb 2023 903rd nyoshe 444 233 2ms 19 Sep 2023 903rd retrohun 444 233 2ms 19 Dec 2024 905th Anonymousellama21 443 368 428ms 27 Apr 2023 906th commandz0 🇺🇸 441 211 490ms 1 Sep 2025 907th HumanoidCPU 441 235 2ms 9 Dec 2025 908th Natanaelel 🇸🇪 440 114 6ms 14 Oct 2021 909th MeWhenI 🇻🇦 439 205 165ms 3 Aug 2024 910th MeWhenI 🇻🇦 439 221 65ms 28 May 2023 911th Andrey-Plotnikov 439 243 16ms 23 Sep 2025 912th bac0id 437 404 599ms 26 Sep 2023 913th ovs-code 🇩🇪 436 115 6ms 23 Jul 2024 914th D-MOVE 🇵🇭 436 139 41ms 4 Feb 2026 915th Indivicivet 436 234 312ms 23 Mar 2021 915th alexeldridge 436 234 21ms 12 Aug 2024 917th MichaelMBradley 🇨🇦 435 245 18ms 18 Mar 2022 918th connorslade 435 541 209ms 12 May 2022 919th MeWhenI 🇻🇦 434 249 1,274ms 10 Nov 2021 920th CaedenHarper 🇨🇦 433 140 44ms 7 Sep 2025 921st CatsAreFluffy 433 239 2ms 18 Dec 2023 922nd SpareManiKatti 433 246 17ms 9 Sep 2021 923rd jhu04 433 408 576ms 18 Jan 2024 924th mcreenan 432 116 6ms 6 Feb 2018 924th iczelia 🇩🇪 432 116 5ms 22 Sep 2025 926th Sticky-Bits 432 236 22ms 26 Apr 2019 926th Code-Coder-coder 432 236 30ms 23 Nov 2025 928th pyrolitic 🇮🇪 431 240 2ms 10 May 2022 929th anter69 🇭🇺 431 266 1,376ms 26 Feb 2026 930th muztanger 431 378 409ms 21 Nov 2021 931st dokutan 429 197 2,465ms 7 Apr 2024 932nd madex 🇩🇪 428 249 13ms 12 days ago 933rd mathb0y512 427 239 461ms 20 Aug 2024 934th IlkkaTakala 427 309 71ms 30 Apr 2024 935th TheZwierzLF 🇵🇱 426 142 35ms 27 Dec 2025 936th szymex73 🇵🇱 426 243 2ms 2 Feb 2024 937th trinityy-7 424 244 2ms 7 Aug 2025 938th TetraPengwin 424 301 3ms 15 Dec 2021 939th Soyo-Wind 424 384 406ms 16 Jul 2025 940th llwwns 423 143 39ms 1 May 2023 941st FoxInTheClouds 423 241 21ms 18 Feb 2026 942nd bb00 423 245 2ms 20 Jan 2024 942nd Yewzir 🇧🇪 423 245 2ms 9 Feb 2024 944th oceko 423 312 66ms 19 Feb 2024 945th JRaspass 🇬🇧 421 141 1,382ms 30 Jan 2023 946th JoeBigToe 421 198 442ms 8 Jun 2020 947th inverseLorentz 🇦🇺 421 253 16ms 12 Jun 2022 947th quirked-up 421 253 11ms 30 Aug 2023 947th MyXoToD 🇩🇪 421 253 11ms 8 May 2025 950th dokutan 421 270 92ms 1 Sep 2024 951st Maltaran 🇵🇱 421 314 421ms 14 Feb 2025 952nd Yewzir 🇧🇪 421 363 98ms 4 Jan 2025 953rd guilhem-roy 🇫🇷 420 243 332ms 27 Jul 2023 954th strout 420 468 161ms 15 Aug 2022 955th sjrct 419 247 2ms 9 Aug 2024 956th fgrosshans 🇫🇷 418 244 23ms 18 Jul 2022 957th HumanoidCPU 418 423 559ms 8 Nov 2025 958th Shanethegamer 🇺🇸 417 275 1,432ms 6 May 2023 959th noescareno 417 424 422ms 15 Feb 2026 960th za3k 416 245 22ms 12 Oct 2022 First Prev 881–960 of 1,447 Next Last