The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 days. Why not try and solve them ahead of time?
Medal Tally 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 amazingalek 🇳🇴 498 250 467ms 25 Jan 2026 482nd MeWhenI 🇻🇦 497 178 171ms 3 Aug 2024 483rd davecame 494 176 11ms 29 Nov 2023 483rd logvp 494 176 18ms 13 Jan 2024 483rd snydej 494 176 12ms 21 Nov 2024 483rd HumanoidCPU 494 176 12ms 5 May 2025 487th dokutan 492 158 391ms 14 Feb 2026 488th andrewjc2000 491 177 17ms 9 Mar 2025 489th Schmitt-Very-Cool 491 335 388ms 2 Oct 2025 490th mousetail 🇳🇱 490 163 7ms 2 Oct 2024 491st Yewzir 🇧🇪 489 159 445ms 28 Jan 2024 492nd junkondo-jp 485 206 11ms 4 Jun 2024 493rd quimey 480 181 11ms 7 Jun 2023 494th Mabeloid 🇳🇴 478 182 15ms 4 May 2025 495th acollett89 478 209 11ms 4 Aug 2025 496th gigaprofisi 🇺🇸 476 210 12ms 10 Aug 2025 497th TFeld00 🇩🇰 475 133 35ms 3 Sep 2024 498th janbehrens 🇩🇪 475 183 11ms 5 Jun 2023 499th msbranicky 475 307 4ms 19 Oct 2023 500th klixel 🇨🇦 470 342 262ms 9 Nov 2024 501st IISResetMe 467 168 367ms 29 Dec 2025 502nd msbranicky 466 345 214ms 19 Oct 2023 503rd MeWhenI 🇻🇦 465 246 13ms 13 Dec 2023 504th RedzGoose 🇦🇺 464 278 127ms 8 Oct 2024 505th davidludwik2370 462 188 10ms 27 Jul 2025 506th nstearns96 🇬🇧 460 189 11ms 31 Dec 2023 507th MeWhenI 🇻🇦 458 195 94ms 28 Oct 2023 508th Yewzir 🇧🇪 458 253 16ms 18 Dec 2024 509th CaedenHarper 🇨🇦 458 272 402ms 17 Oct 2025 510th Yewzir 🇧🇪 453 258 205ms 28 Jan 2024 511th HumanoidCPU 452 172 423ms 5 May 2025 512th janbehrens 🇩🇪 452 173 478ms 11 Jul 2023 513th CaedenHarper 🇨🇦 450 193 30ms 13 Aug 2025 514th speles 🇺🇦 449 261 2ms 10 Nov 2023 515th andre-lameirinhas 🇵🇹 446 195 18ms 1 Jun 2023 516th Isaac-NTT 446 224 12ms 16 Jun 2023 517th jerrandolph 444 364 292ms 23 Dec 2023 518th fkantelberg 441 197 13ms 24 Jul 2023 519th cros107 🇦🇺 439 198 18ms 9 Aug 2023 520th guilhem-roy 🇫🇷 437 199 18ms 20 Jun 2023 521st weliveinhell 🇭🇹 434 230 10ms 21 May 2024 522nd KatieLG 🇬🇧 433 146 34ms 29 Aug 2024 523rd MeWhenI 🇻🇦 432 185 20ms 12 Aug 2024 524th RYNO8 432 201 11ms 13 Nov 2023 525th msbranicky 432 359 4ms 19 Oct 2023 526th Nicronmil 431 232 10ms 7 Jul 2023 527th msbranicky 430 202 17ms 19 Oct 2023 527th evan18c 430 202 12ms 19 Apr 2025 529th Alex-x90 🇺🇸 428 203 11ms 17 Aug 2023 529th Emutis 🇱🇹 428 203 17ms 4 Nov 2025 531st Mabeloid 🇳🇴 427 182 528ms 4 May 2025 532nd msbranicky 426 283 2,841ms 10 Jan 2025 533rd zakariamouhid 425 235 11ms 1 Jun 2023 534th Yewzir 🇧🇪 425 269 10ms 27 Jan 2024 535th FortuiteMan 🇫🇷 418 208 11ms 17 Aug 2023 536th TaserTheFox 🇺🇸 414 210 10ms 1 Jun 2023 536th croc54 414 210 18ms 15 Dec 2024 538th adamnielson42 🇺🇸 412 211 11ms 1 Jun 2023 539th denkyuu1 410 154 38ms 25 Feb 2026 540th CaedenHarper 🇨🇦 407 191 649ms 13 Aug 2025 541st JOrE20 405 414 128ms 5 Dec 2025 542nd jipsong 🇩🇪 402 315 95ms 27 Oct 2023 543rd Andrey135296 399 218 11ms 17 Sep 2024 544th jatloe 395 220 12ms 27 Sep 2024 545th jipsong 🇩🇪 393 221 11ms 5 Jul 2025 546th yzhs 🇩🇪 392 222 13ms 21 Jun 2023 547th dokutan 391 200 612ms 7 Apr 2024 548th rollershutter 390 223 19ms 18 Nov 2025 549th msbranicky 385 202 571ms 17 Jan 2024 550th Widgitty 384 305 2ms 13 Jun 2023 551st Andriamanitra 🇫🇮 383 165 37ms 29 Nov 2023 552nd mbittner20 380 229 11ms 8 Feb 2024 553rd adamnielson42 🇺🇸 380 263 12ms 1 Jun 2023 554th madex 🇩🇪 378 230 18ms 7 Jun 2023 554th ridingqwerty 🇺🇸 378 230 18ms 22 Feb 2024 556th Kaffeleif 378 303 8ms 21 Mar 2024 557th eiburns 365 238 11ms 26 Oct 2023 557th alemelis 365 238 18ms 14 Sep 2024 559th dokutan 362 344 466ms 30 Jul 2025 560th ryanbraganza 359 278 10ms 1 Nov 2024 First Prev 481–560 of 617 Next Last