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?
Emojify 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 481st quimey 538 150 11ms 28 Jun 2023 481st Babafaba 538 150 18ms 3 Nov 2025 483rd postie77 538 184 442ms 8 Sep 2023 484th typeswitch-dev 🇵🇹 536 212 4ms 4 Aug 2023 485th elisherer 🇮🇱 535 190 11ms 1 Jan 2021 486th BREMAUCY 🇫🇷 535 436 11ms 18 Aug 2025 487th OllieBoyne 🇬🇧 534 151 10ms 6 Sep 2022 487th jakobkordez 🇸🇮 534 151 23ms 20 Oct 2022 489th cryptoriddlerUIO 532 186 426ms 4 Mar 2025 490th BambooleanLogic 🇸🇪 532 191 10ms 1 Dec 2021 491st guliyevemil1 🇦🇿 532 265 361ms 31 Jan 2021 492nd dokutan 530 182 39ms 12 Feb 2025 493rd ReidZ3 🇺🇸 530 242 134ms 6 Dec 2020 494th kkoenig 530 266 333ms 13 Sep 2024 495th ArmaanAS 527 193 11ms 2 Apr 2021 495th Y0UR-U5ERNAME 527 193 13ms 3 Sep 2021 495th ForkKILLET 🇨🇳 527 193 10ms 10 Oct 2021 495th LordSir101 527 193 11ms 31 Jul 2025 499th mandm-pt 526 188 471ms 21 Nov 2021 499th emgordon154 526 188 8ms 16 Feb 2025 501st MeWhenI 🇻🇦 526 204 59ms 29 Nov 2022 502nd yzhs 🇩🇪 526 244 145ms 25 Jul 2021 503rd dokutan 525 158 98ms 26 Jan 2026 504th StefanHabel 🇨🇦 524 154 9ms 11 Nov 2022 504th SB-945 524 154 16ms 26 Aug 2023 506th mrmena 🇦🇺 521 179 2ms 5 Mar 2024 507th acollett89 521 195 10ms 15 Jul 2025 507th Lv0Sys 🇵🇱 521 195 15ms 4 Dec 2025 509th alemelis 520 120 516ms 28 Sep 2024 510th shellbertt 🇨🇦 520 155 16ms 18 Dec 2021 510th mossprescott 520 155 10ms 16 Jan 2023 510th yuchuehw 520 155 11ms 16 Jan 2024 513th marcin7Cd 519 168 5ms 31 Jan 2021 514th commandz0 🇺🇸 518 143 518ms 1 Sep 2025 515th wh3n3v3r 🇨🇿 517 156 11ms 18 Nov 2024 516th unfinishedprogram 516 197 10ms 9 Aug 2022 516th trinityy-7 516 197 11ms 28 Oct 2023 518th omri2001 514 157 12ms 20 Oct 2022 518th fkantelberg 514 157 10ms 18 Jul 2025 518th HumanoidCPU 514 157 12ms 11 Jan 2026 521st weliveinhell 🇭🇹 513 275 331ms 22 Sep 2023 522nd cafehaine 🇫🇷 511 198 2ms 22 Sep 2022 523rd guilhem-roy 🇫🇷 510 158 11ms 5 Oct 2022 523rd carotinoid 🇰🇷 510 158 10ms 2 days ago 525th Sora1248 🇩🇪 510 170 2ms 12 Feb 2023 525th dokutan 510 170 2ms 8 Nov 2025 527th janbehrens 🇩🇪 510 194 471ms 10 Jul 2023 528th Babafaba 508 146 492ms 3 Nov 2025 529th TRexOnGit 508 200 10ms 4 Apr 2025 530th janbehrens 🇩🇪 507 184 8ms 10 Jul 2023 531st jerrandolph 507 278 386ms 21 Oct 2023 532nd LukeBridges 🇬🇧 506 201 13ms 31 Jan 2025 533rd m42km 504 160 12ms 19 Oct 2023 533rd RaBa21 🇭🇺 504 160 10ms 19 Jul 2025 533rd solisolu 504 160 10ms 15 Oct 2025 536th dokutan 502 223 44ms 28 Aug 2024 537th adamnielson42 🇺🇸 501 161 18ms 22 May 2023 538th non-bin 501 203 11ms 25 Jun 2025 539th dpethes 500 198 493ms 26 Jul 2022 539th louisoftokyo 500 198 416ms 10 Oct 2025 541st MeWhenI 🇻🇦 498 174 2ms 25 Aug 2023 542nd mrmena 🇦🇺 498 204 10ms 20 Mar 2024 542nd CarsonChr 🇺🇸 498 204 15ms 23 Apr 2024 544th Natanaelel 🇸🇪 497 135 36ms 28 Nov 2023 545th TheBlupper 495 163 12ms 8 Nov 2022 545th Yewzir 🇧🇪 495 163 10ms 18 Jul 2023 547th TimCurwick 🇺🇸 493 152 261ms 26 Nov 2020 548th annaproxy 492 109 2ms 19 Feb 2022 549th HerLovelyTentacles 492 164 18ms 18 Apr 2021 549th knutae 🇳🇴 492 164 10ms 29 Jun 2021 551st ericlangedijk 🇸🇮 492 201 466ms 18 Mar 2022 551st c0d3-4-F00d 🇩🇪 492 201 494ms 25 Mar 2022 553rd prestosilver 🇺🇸 491 192 398ms 19 days ago 554th JVerwolf 489 165 13ms 25 Aug 2021 554th aaa123git 489 165 10ms 18 Jul 2024 556th davyboyhayes 489 208 12ms 3 Feb 2023 557th tsunderu 🇯🇵 487 178 2ms 3 Sep 2021 558th codewrite 🇬🇧 487 203 442ms 6 Jan 2026 559th sleepyStick 486 166 9ms 4 Dec 2021 559th amollberg 🇸🇪 486 166 17ms 29 Jan 2022 First Prev 481–560 of 1,338 Next Last