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?
Rijndael S-box 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 880th CaedenHarper 🇨🇦 172 1,259 5ms 17 Aug 2025 882nd msbranicky 171 601 11ms 8 Sep 2023 883rd msbranicky 171 614 135ms 1 Oct 2023 884th Shanethegamer 🇺🇸 171 774 74ms 1 Sep 2023 884th HumanoidCPU 171 774 73ms 9 May 2024 884th CaedenHarper 🇨🇦 171 774 77ms 22 Jan 2025 887th Shanethegamer 🇺🇸 171 786 396ms 1 Sep 2023 887th MeWhenI 🇻🇦 171 786 361ms 1 Sep 2023 887th Maximizer02 171 786 364ms 12 Mar 2024 887th KatieLG 🇬🇧 171 786 362ms 5 May 2024 887th Jacob385 171 786 365ms 18 Mar 2025 887th fuzzylojik-golf 🇺🇸 171 786 357ms 7 Sep 2025 887th Babafaba 171 786 355ms 30 Oct 2025 887th HumanoidCPU 171 786 362ms 9 Nov 2025 887th ndren 171 786 413ms 10 Feb 2026 896th mwarvik 🇳🇴 171 787 369ms 29 Dec 2025 897th neihousaigaai 170 502 9ms 12 Feb 2024 898th MeWhenI 🇻🇦 170 778 74ms 1 Sep 2023 898th Mabeloid 🇳🇴 170 778 72ms 21 Sep 2024 900th Adix-null 🇱🇹 170 790 364ms 10 Dec 2024 900th rollershutter 170 790 365ms 29 Jan 2025 900th heanyang1 170 790 356ms 23 May 2025 900th KasperKivimaeki 🇫🇮 170 790 370ms 2 Jul 2025 900th Blockyheadman 170 790 365ms 6 Nov 2025 900th CornerMercury 🇬🇧 170 790 433ms 10 Feb 2026 906th KatieLG 🇬🇧 170 938 1,688ms 13 Sep 2025 907th Shanethegamer 🇺🇸 169 774 3ms 1 Sep 2023 907th KatieLG 🇬🇧 169 774 2ms 2 Sep 2023 907th KatieLG-Transpiler 🇬🇧 169 774 3ms 2 Sep 2023 907th theunofficialcoder 169 774 3ms 7 Jan 2024 907th Mabeloid 🇳🇴 169 774 3ms 21 Sep 2024 907th xyangst 169 774 3ms 12 Oct 2024 907th CaedenHarper 🇨🇦 169 774 2ms 22 Jan 2025 907th ehulinsky 🇺🇸 169 774 3ms 26 Mar 2025 915th Zach1031 169 795 406ms 23 Nov 2025 916th rollershutter 169 847 405ms 29 Jan 2025 917th ndren 168 620 95ms 3 Sep 2023 918th Mabeloid 🇳🇴 168 800 366ms 21 Sep 2024 918th GolfingSuccess 🇬🇷 168 800 358ms 17 Oct 2024 918th aksyristos 168 800 444ms 18 Oct 2024 918th QeepQeep 168 800 376ms 10 Nov 2024 918th Quirkly-Quasar 168 800 370ms 23 Nov 2024 918th neel11235813 168 800 357ms 9 Dec 2024 918th Schmitt-Very-Cool 168 800 350ms 28 May 2025 918th JOrE-Softwares 168 800 359ms 1 Jun 2025 918th BREMAUCY 🇫🇷 168 800 374ms 7 Aug 2025 918th JOrE20 168 800 390ms 6 Nov 2025 918th gigaprofisi 🇺🇸 168 800 363ms 13 Nov 2025 929th dokutan 168 815 39ms 19 Oct 2024 930th Mabeloid 🇳🇴 168 855 398ms 21 Sep 2024 931st KatieLG 🇬🇧 167 793 70ms 2 Sep 2023 931st KatieLG-Transpiler 🇬🇧 167 793 66ms 2 Sep 2023 933rd yhm138 167 802 388ms 17 Feb 2025 934th adamnielson42 🇺🇸 167 803 374ms 3 Dec 2024 935th KatieLG-Transpiler 🇬🇧 167 804 417ms 2 Sep 2023 935th retrohun 167 804 378ms 18 Oct 2024 935th SB-945 167 804 379ms 30 Nov 2024 935th JunkIce 167 804 372ms 23 Jan 2025 935th olleicua 🇺🇸 167 804 378ms 23 Jan 2025 935th zt14427 167 804 421ms 11 Feb 2025 935th Ralac07 🇦🇺 167 804 381ms 18 Apr 2025 935th Stockoh 🇫🇷 167 804 411ms 9 Jan 2026 943rd denkyuu1 166 453 34ms 18 days ago 944th KatieLG-Transpiler 🇬🇧 166 866 387ms 2 Sep 2023 945th olleicua 🇺🇸 164 460 38ms 11 Apr 2024 946th Shanethegamer 🇺🇸 163 794 1ms 1 Sep 2023 946th HumanoidCPU 163 794 1ms 16 Jun 2024 946th snoozingnewt 🇨🇦 163 794 1ms 1 Sep 2024 946th CaedenHarper 🇨🇦 163 794 1ms 24 Jan 2025 946th fuzzylojik-golf 🇺🇸 163 794 1ms 8 Jul 2025 951st MeWhenI 🇻🇦 163 796 1ms 1 Sep 2023 952nd KatieLG 🇬🇧 163 839 39ms 29 Mar 2024 953rd msbranicky 162 527 9ms 1 Sep 2023 954th msbranicky 162 584 156ms 1 Sep 2023 955th KatieLG 🇬🇧 162 798 1ms 2 Sep 2023 955th Mabeloid 🇳🇴 162 798 1ms 21 Sep 2024 957th KatieLG-Transpiler 🇬🇧 162 801 1ms 2 Sep 2023 958th ridingqwerty 🇺🇸 161 391 2ms 21 Feb 2024 959th stellartux 161 636 304ms 31 Dec 2023 960th Ralac07 🇦🇺 161 640 10ms 18 Apr 2025 First Prev 881–960 of 1,413 Next Last