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?
Rock-paper-scissors-Spock-lizard 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 561st janbehrens 🇩🇪 511 204 267ms 17 Jan 2024 562nd jerrandolph 511 458 355ms 21 Oct 2023 563rd tnecio 510 212 20ms 30 Aug 2020 563rd jmerle 🇳🇱 510 212 12ms 22 Jan 2022 563rd CedricGebistorf 510 212 10ms 16 Mar 2022 563rd andrewjc2000 510 212 11ms 3 Mar 2025 567th Jandoife 510 366 2ms 19 Jan 2023 568th MeWhenI 🇻🇦 509 587 1,996ms 22 Apr 2024 569th aksyristos 508 213 17ms 7 hours ago 570th vroup 🇩🇰 507 254 10ms 18 Aug 2025 571st doberan 506 214 10ms 31 Oct 2020 571st olavaga 506 214 11ms 16 Aug 2021 571st HumanoidCPU 506 214 11ms 6 Aug 2024 571st nemoyatpeace 506 214 10ms 29 Jan 2026 575th MeWhenI 🇻🇦 506 221 2ms 12 May 2022 576th Shanethegamer 🇺🇸 504 384 4ms 8 Feb 2025 577th HallMatthew314 502 251 1,587ms 14 Sep 2022 578th lynn 502 273 37ms 19 Apr 2021 579th KatieLG 🇬🇧 502 471 2ms 23 Mar 2024 580th nullie 501 216 11ms 15 Jun 2022 581st saito-ta 🇯🇵 500 144 43ms 26 Aug 2022 581st primo-ppcg 🇹🇭 500 144 45ms 10 Feb 2023 583rd tomh1012 500 387 4ms 4 Feb 2026 584th b10011 🇫🇮 499 217 17ms 25 Jun 2020 584th adamnielson42 🇺🇸 499 217 11ms 1 Dec 2023 584th nstearns96 🇬🇧 499 217 12ms 23 Oct 2024 587th blaztoma 🇱🇹 499 350 162ms 26 Dec 2025 588th msbranicky 498 475 2ms 11 Oct 2023 589th postie77 497 385 471ms 14 Jun 2023 590th TaserTheFox 🇺🇸 496 218 11ms 8 Feb 2023 590th Lv0Sys 🇵🇱 496 218 20ms 3 Dec 2025 592nd annaproxy 496 248 3ms 23 Feb 2022 593rd rollershutter 495 255 7ms 7 Jun 2024 594th tpaxman 🇨🇦 494 219 11ms 9 Dec 2020 595th amollberg 🇸🇪 492 220 10ms 20 Jan 2024 596th MeWhenI 🇻🇦 492 502 42ms 4 Apr 2023 597th Haksell 🇦🇶 491 154 35ms 22 Feb 2023 597th Andriamanitra 🇫🇮 491 154 33ms 26 Apr 2023 599th yanjs 490 221 18ms 1 Oct 2021 600th MeWhenI 🇻🇦 490 275 2ms 12 Nov 2022 601st jmerle 🇳🇱 489 396 4ms 6 Jul 2023 601st roguh 🇬🇹 489 396 4ms 27 Jan 2024 603rd olleicua 🇺🇸 488 155 35ms 6 Dec 2024 604th dokutan 487 207 720ms 12 Feb 2025 605th Y0UR-U5ERNAME 487 222 15ms 4 Sep 2021 605th RDShah 487 222 14ms 27 Nov 2021 605th try-except-try-accept 🇹🇭 487 222 20ms 28 Jun 2022 605th croc54 487 222 11ms 16 Jan 2025 609th dokutan 487 398 4ms 30 May 2023 610th dokutan 487 791 11ms 24 Dec 2024 611th stellartux 485 208 450ms 26 Dec 2023 612th rollershutter 485 223 11ms 25 Mar 2024 612th davidludwik2370 485 223 10ms 17 Sep 2025 614th warmCabin 485 385 2ms 18 Dec 2019 615th error256 484 228 101ms 11 Apr 2025 616th cellobix 483 224 10ms 15 Aug 2019 616th domingues 🇵🇹 483 224 10ms 10 Aug 2022 616th vishwathg 483 224 11ms 3 Apr 2023 619th HumanoidCPU 482 210 526ms 7 Aug 2024 620th error256 481 157 38ms 8 May 2025 621st dzhang314 481 225 11ms 14 Aug 2019 622nd CheeseCake628 🇳🇴 479 226 54ms 13 Feb 2023 622nd celiendonze 🇨🇭 479 226 10ms 5 Jul 2023 624th tomh1012 479 269 11ms 20 Sep 2020 624th dbkirk4211 479 269 13ms 4 May 2024 626th msbranicky 479 488 346ms 31 Aug 2023 627th stefangimmillaro 477 234 2ms 17 Jul 2025 628th MeWhenI 🇻🇦 477 356 7ms 13 Dec 2023 629th MeWhenI 🇻🇦 476 310 5ms 28 May 2023 630th LostSyntax21 🇬🇧 474 228 20ms 1 Dec 2025 631st jacobly0 🇺🇸 474 630 1,983ms 22 Apr 2024 632nd za3k 470 230 10ms 12 Oct 2022 633rd MeWhenI 🇻🇦 470 242 174ms 3 Aug 2024 634th MeepMoop 470 312 2ms 8 Apr 2025 635th The-Wolfson 470 410 105ms 31 Oct 2024 636th gifti258 469 291 97ms 14 Sep 2023 637th CaedenHarper 🇨🇦 469 380 811ms 3 Oct 2025 638th adoxography 468 231 10ms 10 Mar 2020 638th richard-oelze 🇩🇪 468 231 11ms 7 Feb 2021 638th jacklynnepenick 468 231 11ms 25 Aug 2021 First Prev 561–640 of 1,132 Next Last