The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 days. Why not try and solve them ahead of time?
Proximity Grid 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 albanian-laundromat 673 128 2,389ms 16 Sep 2025 242nd MeWhenI 🇻🇦 671 192 2ms 4 Jan 2025 243rd MeWhenI 🇻🇦 670 95 17ms 16 Apr 2023 244th Lydxn 🇨🇦 670 96 261ms 4 Aug 2022 245th TFeld00 🇩🇰 668 135 76ms 3 Oct 2022 246th MeWhenI 🇻🇦 668 217 199ms 18 Nov 2022 247th MeWhenI 🇻🇦 667 129 970ms 15 Sep 2025 248th MeWhenI 🇻🇦 665 149 16ms 6 Aug 2022 249th albanian-laundromat 663 136 93ms 22 Aug 2025 250th antimon2 🇯🇵 662 109 1,168ms 10 Aug 2022 251st snoozingnewt 🇨🇦 662 283 111ms 20 Nov 2025 252nd MeWhenI 🇻🇦 662 290 1,775ms 7 Nov 2025 253rd jared-hughes 660 225 440ms 4 Aug 2022 254th retrohun 656 175 1,570ms 5 Aug 2022 255th albanian-laundromat 655 131 511ms 12 Sep 2025 256th Shanethegamer 🇺🇸 653 138 70ms 28 Apr 2023 257th ovs-code 🇩🇪 648 139 25ms 25 Nov 2025 258th AlephSquirrel 645 245 75ms 3 Oct 2025 259th nwellnhof 🇩🇪 644 140 41ms 11 Jul 2023 260th annaproxy 644 244 457ms 11 Apr 2025 261st MeWhenI 🇻🇦 643 120 250ms 28 Jan 2023 262nd emgordon154 643 154 16ms 8 Aug 2024 263rd nwellnhof 🇩🇪 642 154 89ms 16 Aug 2022 264th jared-hughes 641 201 5ms 4 Aug 2022 265th MeWhenI 🇻🇦 641 327 45ms 4 Sep 2024 266th Artemis21 🇬🇧 639 141 180ms 10 Jan 2025 267th janbehrens 🇩🇪 639 246 415ms 26 Nov 2022 268th nwellnhof 🇩🇪 638 96 316ms 12 Jul 2023 269th MeWhenI 🇻🇦 638 113 358ms 15 Feb 2023 270th Shanethegamer 🇺🇸 637 191 77ms 13 Jun 2024 271st m-tkach 🇺🇦 637 382 2,578ms 15 Jan 2025 272nd itsh01 635 156 13ms 17 Aug 2022 273rd blaztoma 🇱🇹 630 101 16ms 11 Dec 2025 274th jatloe 630 143 66ms 29 Oct 2024 275th Natanaelel 🇸🇪 627 258 344ms 27 Apr 2025 276th ovs-code 🇩🇪 626 137 517ms 25 Nov 2025 277th ndren 626 144 476ms 10 Oct 2023 278th Shanethegamer 🇺🇸 622 138 436ms 20 Oct 2024 279th 5cw 🇺🇸 622 145 77ms 14 May 2024 280th stefangimmillaro 622 2,255 6ms 27 Sep 2023 281st MeWhenI 🇻🇦 616 270 6ms 25 Dec 2022 282nd sisyphus-ppcg 🇦🇺 613 147 53ms 5 Aug 2022 282nd stefangimmillaro 613 147 21ms 28 Sep 2023 282nd xsot 🇸🇬 613 147 70ms 16 Jun 2024 285th rucin93 🇵🇱 612 130 156ms 31 Oct 2024 286th JOrE20 611 162 13ms 24 Feb 2026 287th bricknellj 609 148 81ms 6 Feb 2025 287th snoozingnewt 🇨🇦 609 148 11ms 20 Nov 2025 289th MeWhenI 🇻🇦 608 237 41ms 29 Apr 2025 290th Natanaelel 🇸🇪 607 106 161ms 14 Nov 2024 291st MeWhenI 🇻🇦 605 149 148ms 5 Aug 2022 291st bizy-coder 605 149 21ms 20 Dec 2025 291st edsrzf 🇳🇿 605 149 20ms 26 days ago 294th clockworknazo 602 166 140ms 13 Oct 2022 295th emgordon154 601 107 54ms 2 Aug 2024 296th jared-hughes 601 191 1,546ms 4 Aug 2022 297th blaztoma 🇱🇹 597 151 70ms 7 days ago 298th Salutations45 597 166 16ms 19 Jan 2025 299th snoozingnewt 🇨🇦 596 144 405ms 20 Nov 2025 300th emgordon154 595 201 371ms 1 Feb 2026 301st Waffle3z 591 208 86ms 5 Aug 2022 302nd GrayJoKing 🇦🇺 590 109 81ms 27 Dec 2023 303rd GolfingSuccess 🇬🇷 588 68 260ms 4 Aug 2022 304th Lv0Sys 🇵🇱 587 335 271ms 27 days ago 305th SB-945 585 154 42ms 17 Apr 2024 305th ryyyn 🇺🇸 585 154 76ms 10 Jun 2025 307th coreynash 583 170 13ms 6 Feb 2024 308th Natanaelel 🇸🇪 582 94 30ms 25 Jul 2023 309th Shanethegamer 🇺🇸 582 240 458ms 1 Feb 2025 310th SirBogman 🇺🇸 580 148 463ms 20 Jan 2024 310th MeWhenI 🇻🇦 580 148 584ms 24 May 2024 312th MeWhenI 🇻🇦 579 238 99ms 10 Jun 2024 313th m-tkach 🇺🇦 578 257 64ms 12 Aug 2022 314th jerrandolph 578 340 276ms 19 Dec 2023 315th AlephSquirrel 576 149 569ms 21 Jan 2024 316th msbranicky 575 342 282ms 31 Aug 2023 317th AlephSquirrel 574 157 115ms 4 Aug 2022 318th targrik 573 168 20ms 20 Aug 2025 319th msbranicky 573 290 8ms 12 Aug 2023 320th elgan65536 🇺🇸 571 311 173ms 6 Jul 2024 First Prev 241–320 of 596 Next Last