The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 days. Why not try and solve them ahead of time?
Reverse Polish Notation in all languages in bytes. 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 Bytes Time Submitted 880th cbrt-x 599 266 425ms 6 May 2022 882nd CaedenHarper 🇨🇦 597 82 40ms 13 Sep 2025 883rd AstroOrbis 597 168 9ms 28 Feb 2026 884th genmeblog 594 169 8ms 11 Dec 2023 885th RZ781 592 175 9ms 27 Nov 2023 886th jhpaques 🇫🇷 589 176 18ms 27 Jul 2022 887th pschmid0 🇺🇸 588 142 5ms 17 Oct 2022 888th mwja 587 125 12ms 22 Aug 2024 889th 0xjac 🇨🇭 586 312 298ms 8 Jun 2025 890th Florian-Mt 585 177 16ms 15 Jul 2024 891st Shanethegamer 🇺🇸 584 99 323ms 20 Apr 2022 892nd jared-hughes 584 103 44ms 18 Jul 2022 893rd KatieLG 🇬🇧 584 141 487ms 17 Aug 2024 894th stefangimmillaro 584 190 118ms 22 Oct 2022 895th KatieLG 🇬🇧 584 231 194ms 21 Nov 2025 896th eiburns 582 126 11ms 28 Feb 2022 896th tomh1012 582 126 13ms 4 Mar 2022 896th Vaekor 582 126 13ms 28 Jul 2023 896th iczelia 🇩🇪 582 126 10ms 11 Oct 2025 900th jmerle 🇳🇱 582 178 17ms 15 Feb 2023 901st Phil-RGOMEGA 581 169 2ms 30 Aug 2023 902nd Mabeloid 🇳🇴 578 170 3ms 29 Sep 2024 903rd Aurel300 🇨🇭 577 324 212ms 3 Jun 2024 904th CheeseCake628 🇳🇴 576 180 17ms 11 Dec 2023 904th rustykitty 🇺🇸 576 180 10ms 31 Oct 2025 906th MeWhenI 🇻🇦 576 234 467ms 19 Aug 2022 907th aliakseikalosha 576 238 417ms 16 Jul 2025 908th acollett89 573 128 11ms 4 Aug 2025 909th emgordon154 570 143 9ms 23 Dec 2024 910th TheZwierzLF 🇵🇱 569 86 34ms 20 Dec 2025 911th arjanadriaanse 🇳🇱 568 50 5ms 23 Feb 2022 912th Mabeloid 🇳🇴 568 145 521ms 4 May 2025 913th Trunksistor 🇫🇷 566 183 15ms 14 Apr 2022 914th akiratee 563 87 37ms 20 Oct 2025 915th jacksonhenry3 563 184 15ms 7 Mar 2023 916th aposteriorist 🇨🇦 562 240 473ms 28 Feb 2022 917th Shanethegamer 🇺🇸 561 184 11ms 4 Oct 2024 918th Shanethegamer 🇺🇸 560 149 5ms 2 Jul 2023 919th S-Ruban 560 185 15ms 28 Feb 2023 920th targrik 559 327 282ms 3 Jul 2025 921st Stockoh 🇫🇷 557 148 464ms 24 Jun 2024 922nd FlorianCassayre 🇫🇷 556 132 12ms 18 Sep 2022 923rd EnisEfe0 554 187 15ms 11 May 2025 924th iczelia 🇩🇪 554 212 1ms 11 Oct 2025 925th destofr 554 231 383ms 30 Dec 2022 926th msbranicky 553 338 287ms 6 Oct 2023 927th dokutan 552 148 412ms 14 Sep 2024 928th msbranicky 552 244 2,760ms 9 Jan 2025 929th dranjohn 551 188 17ms 11 Sep 2023 930th annaproxy 550 89 36ms 14 Sep 2023 930th aksyristos 550 89 35ms 3 hours ago 932nd keelimeguy 🇺🇸 550 255 2,844ms 5 Nov 2023 932nd yeminghan2021 550 255 64ms 2 Feb 2025 934th KatieLG 🇬🇧 549 74 4ms 19 Mar 2022 935th c0d3-4-F00d 🇩🇪 549 214 2ms 24 Feb 2022 936th zakariamouhid 548 134 12ms 11 May 2023 937th guilhem-roy 🇫🇷 545 190 10ms 3 Mar 2022 938th albanian-laundromat 544 117 2,839ms 22 Sep 2025 939th codewrite 🇬🇧 544 252 393ms 13 May 2025 940th VictorFordham 543 191 11ms 14 Feb 2024 941st Shanethegamer 🇺🇸 542 116 1ms 5 Nov 2022 941st GolfingSuccess 🇬🇷 542 116 2ms 22 Feb 2026 943rd MeWhenI 🇻🇦 540 64 2ms 15 Feb 2022 944th bac0id 539 218 1ms 27 Jun 2024 945th hjcafaroUC 539 260 2,890ms 20 Aug 2022 946th msbranicky 539 267 2ms 12 Aug 2023 947th dillon-duncando 537 193 15ms 22 Sep 2022 948th KatieLG-Transpiler 🇬🇧 535 154 473ms 16 Aug 2024 949th MeWhenI 🇻🇦 534 76 6ms 16 Apr 2023 950th snoozingnewt 🇨🇦 534 174 135ms 10 Feb 2026 951st snoozingnewt 🇨🇦 534 253 111ms 8 Oct 2025 952nd MeWhenI 🇻🇦 533 208 115ms 16 Oct 2022 953rd m42km 532 155 531ms 9 Feb 2024 954th IlkkaTakala 531 264 3,011ms 20 Dec 2023 955th KatieLG 🇬🇧 531 470 1,882ms 21 Nov 2025 956th codewrite 🇬🇧 530 345 271ms 16 Jun 2025 957th Omega65536 🇩🇪 529 196 10ms 29 Nov 2022 957th celiendonze 🇨🇭 529 196 16ms 5 Jul 2023 959th JOrE20 529 357 62ms 16 Feb 2026 960th varhammer 526 196 5ms 13 Dec 2023 First Prev 881–960 of 1,192 Next Last