Log In  




by szczm_

With the launch of PICOWARE, I got many reports from player saying they got a "communication error" when trying to play the minigames. This error was a fail-safe mechanism intended to avoid a situation, wherein someone tries to start a minigame cart in any other way than from the main cart.

The implementation is: on main cart load, zero out the "difficulty" save data. On subcart load, set the difficulty — it's guaranteed to be in range 1..15. In subcart, check if saved difficulty is 0 — if yes, stop the cart and display a message about a communication error.

Subcarts decide what mode/difficulty/minigame will be used based on the data received from the main cart, and so this is to enforce starting from the main cart. Furthermore, after a whole playthrough, subcarts are supposed to return to the main cart and inform it of the score. Can't imagine a situation when the player starts a minigame in a "single minigame" mode, then the subcart starts the whole story mode, and after finishing returns to the story cart which informs the player that they beat the whole stage.

As players started flooding in, I got reports saying they get the "communication error" during normal play. Different browsers, different operating systems, web and standalone, online and offline, and very unreliable. Further investigation showed that indeed — very rarely, with no noticable pattern — the save data in the subcart is zeroed out.

Nothing seems to have any effect on this bug: changed dset/dget to poke4/peek4, tried setting the data a few seconds before the load, still the bug hasn't disappeared. Tried reproducing this with a set of test carts using code below:


function _init()

 -- set to a random number
 for i=1,10 do dset(0, rnd(-1)) end

 dset(0, 1337)
 load("b.p8.png", "breadcrumb")


function _init()

 -- should fail if dget(0) ~= 0
 if dget(0) == 1337 then

 cls() print(dget(0), 1, 1, 7)
 flip() repeat until false

I've had this running non-stop for 10 minutes, and… nothing. This just works. I'm lost. This probably is influenced also by something else — PICOWARE cart is so dense (it seems to have broken the cart image somehow), maybe that could be a factor.

Here is a GIF of me reproducing the bug (PICO-8 standalone, offline cart):

And the steps to reproduce:

  1. Load PICOWARE (e.g. load #picoware)
  2. Start story cart (any mode, any cart)
  3. If cart was loaded and started correctly, go back using the breadcrumb menuitem and try again until bug occurs

Also, one thing I noticed personally — this never happened the other way around, that is when returning from a subcart. Although communication data in the subcart is set instantly right before returning, there never appears any problem with the main cart receiving this data — which, if happened, would appear as the main cart showing the title screen first instead of the cart view/score screen (cartdata is used for this too).

This seems like a very peculiar bug, nonetheless one that affected many PICOWARE players, and I'm lost trying to figure out the root of this.

EDIT: Additional updates in comments below.

P#66557 2019-08-11 19:25 ( Edited 2019-08-17 19:56)

KNOWN BUG: If you get a "communication error", try refreshing, or use a different browser or device.

Cart [#picoware-18#] | Code | 2019-08-13 | License: CC4-BY-NC-SA | Embed


Do you love WarioWare? And do you love PICO-8? What we if we combine them into one game that you can play in your browser, right now?

Say hello to PICOWARE!

Over 50+ developers made 68 microgames during the 24 hour PICOWARE gamejam starting on July 27th 2019, with the intention of combining them together into one bigger game, called PICOWARE!

It's there! Up above! This is the game! The game all the cool kids play! Don't you want to join them? Do you want to stick out? Of course not!


Fancy a fancy link? Here!

Use Twitter? Here's the official tweet-tweet!

Use PICO-8? I— I hope you do. Just say the magic word:
load #picoware


Here are all creators of the PICOWARE minigames, in no particular order:

  1. Pico-Race, made by @random_disconnect
  2. Sleepers Sheepers, made by Jpecina and TyPhyter
  3. Barbershop Sim, made by @demonicx + @setff
  4. Wake-up Call, made by GreenCheekGames
  5. Pick a Good One!, made by @Leo9
  6. Get Through the Day, made by LuBu
  7. Stay Dry, made by Javier Rizzo
  8. Slam Dunk, made by @v360dev
  9. Pet the Puppos, made by dekent.itch.io
  10. Shine the Spotlight, made by JWinslow23
  11. Catch All the Stars, made by @picoter8
  12. Save Helpi from Bosso, made by @thattomhall
  13. Beam Up Jelpi, made by joll05
  14. Abduct the Cows, made by @mauszozo
  15. Avoid the Flying Jelpis, made by @picoter8
  16. Shoot the Spaceship, made by Javier Rizzo
  17. Survive the Zombie Jelpis, made by @picoter8
  18. Existence, made by @RhizomaticWarmachine
  19. Spaceship Landing, made by Jesus Gonzalez
  20. Alien Rescue, made by @sam_c_lee
  21. They Live, made by @RhizomaticWarmachine
  22. Jumpship!, made by @bellicapax
  23. Super Jelpi, made by Eos Wander
  24. Crush in a Jam, made by knh190
  25. Wigglebee, made by @katbuilt and @acreature
  26. Oh Nose! More Bees!, made by @Jusiv_
  27. Obligatory Bee Game, made by @RhizomaticWarmachine
  28. Beware of Flower Pots, made by Insane Scatterbrain
  29. Humble Bumble, made by MasterNyborg and Buzby
  30. Sheer the Sheep, made by @ctinney94
  31. Save Sugar Cube!, made by cpiod
  32. Dizzy Fly, made by My Roe Ate
  33. Combo Bounce, made by @DoubleATam
  34. Home for a Hermit Crab, made by @josephmarksjr
  35. Help Jelpi Vent!, made by Jamie
  36. Climb the Tree, made by JustFire45
  37. Ruin the Party, made by @peepeenanah
  38. Sushi Scramble, made by @Robotinker
  39. Drop the Mint, made by Dooma4
  40. Perfect Beer, made by Dooma4
  41. Get the Balloon!, made by Stephmo
  42. Spotlight Landing, made by @svntax
  43. Target Practice, made by @FuwanekoGames
  44. Pop the Balloon, made by fwip
  45. Paper Airplane, made by @RhizomaticWarmachine
  46. Frequency Check, made by dberzins
  47. Bubble Fishy, made by qst0
  48. Scratch the Advertising!, made by OniriCorpe
  49. Publish or Perish, made by Kirais
  50. Sort Out the Beans, made by @yeff
  51. Find the Backwards Word, made by @nephilim
  52. Lantern Lights, made by capucat
  53. Get the Shape!, made by @reecegames1
  54. Fill the Buckets, made by fwip
  55. Jelpi Counter, made by @sam_c_lee
  56. Ninja Sort, made by Cupcake<3 (Paul Wandley)
  57. Jelpuzzle, made by @vrnspr
  58. Pour the Tea into the Cup, made by JWinslow23
  59. Walk on Ice, made by knh190
  60. Jelpi Lander, made by Jamie
  61. Slide to the Goal Tile, made by Numzyx
  62. Fuzero, made by @planeteightgames
  63. Supportive Chatroom, made by @noscoperadio
  64. Jelpocracy, made by GooGroker
  65. Tetrominoes in the Night, made by @alce_x and Lin Han
  66. Get the Cherry, made by Akumarai
  67. Catch the Bar!, made by cpiod
  68. Don't Drown, made by @pixelsixnet

…and the people without whom making the final game wouldn't be possible:


Notice any bugs? Your Jelpi's not working! Help us make PICOWARE the best it can be and post feedback using any method you want!


P#65884 2019-07-16 10:49 ( Edited 2019-08-13 19:09)

Cart [#growth-3#] | Code | 2019-07-17 | License: CC4-BY-NC-SA | Embed

A flower blooms slowly towards the sky.

This is a game made for the 220th One Hour Game Jam, the theme of which was "Growth".

Also on itch.io.

Cart art by the amazing Wallkick!

P#65822 2019-07-13 21:41 ( Edited 2019-07-17 17:43)

Cart [#citylimits-0#] | Code | 2019-07-07 | License: CC4-BY-NC-SA | Embed

Drive recklessly and try not to crash in this Reckless Driving Simulator 2019 Extreme Deluxe Edition called City Limits! (DLC not included)

This is a game made for the 219th One Hour Game Jam, the theme of which was "Limit".

Also available on itch.io.

P#65671 2019-07-07 10:19 ( Edited 2019-07-07 10:20)

Cart [#liines-0#] | Code | 2019-05-21 | License: CC4-BY-NC-SA | Embed

LIINES, a short demo released at Moonshine Dragons 2019 demoparty in Opole, Poland for the wild competition.

Not tested exhaustively in browsers, and it can go out of sync. If you experience any bugs, let me know!

For best experience, download cart, or binaries (Windows, Mac, Linux) here.

P#64653 2019-05-21 14:43 ( Edited 2019-05-21 17:46)

Cart [#befunge-0#] | Code | 2019-05-10 | License: CC4-BY-NC-SA | Embed

This is a Befunge-93 interpreter that I made in a few days. Tested on all examples from Rosetta Code that fit. You can finally code in an esoteric language inside a fantasy console!

Excuse me, what is Befunge?

Befunge is a stack-based, esoteric programming language, in which the code is represented on a two-dimensional grid. The control flow of the program is directed using instructions such as v, >, ^ and < (respectively: down, right, up, left). If a border is reached, the program wraps around (both directions). Single character instructions can pop values of the stack, or place them on top of the stack, and act based on the retrieved values. Read more on Wikipedia.

…what instructions?

Here's the list of all instructions explained, also on Wikipedia. There are not many of them, and most are self-explanatory (arrow instructions, arithmetic operators, numbers). Just like with any other language, the more fun you have with it, the more you'll learn!

…and why should I care?

In my opinion, Befunge really tests (and improves) your logical thinking and flow control skills. This is also a language like no other, in which you can actually visualize the control flow on a grid. Lastly, this is a stack based language, so it teaches you how to operate under a set of limitations (of course, you can just store and read values using g and p instructions, but that's cheating (not really)).

Also, you don't have to care if you don't want to! Democracy!

Okay, maybe some examples?


Hello World!

"!dlrow olleh",,,,,,,,,,,,@

First, " enables string mode; all characters until next " will be pushed into the stack as ASCII values. Then, the string hello world! is pushed onto the stack (values go bottom to top on the stack). Then , prints a single character, so all characters are printed. Finally, @ ends the program.

Multiply n numbers together

  ^       _\[email protected]

Push 1, then prompt user for n (&, stack: 1 [n]). Swap two top values (\, stack: [n] 1). Prompt user for a number a (stack: [n] 1 [a]), then multiply (*, stack: [n] 1*[a]). Swap values again (stack: 1*[a] [n]), subtract 1 (stack: 1*[a] [n]-1), and if the new value is 0, go right (_), swap values (stack: 0 1*[a]), print number (.) and end the program (@). Otherwise, repeat.

99 Bottles of Beer

92+9*07pv,_       $:|
>       >:^:<       >   70g!#@_^
^:+670+1g70"bottles of beer on"<
>"selttob"07g1+067+",llaw eht "^
^" of beer"+76"take one down a"<
>"lttob"07g0"dnuora ti ssap dn"^
^"es of beer on the wall!"+76  <

Sadly, I made this one myself. I'll let you figure this one out. Most important aspects of this code:

  • 07p stores the top value in cell (0,7), 07g retrieves it
  • +67 is 6+7=13 == "\r", carriage return, which is a newline in PICO-8
  • a 0 is always appended after bottle count, that is to be able to discern if a character or a number should be printed
  • going past grid borders wraps around


  • Visualization! See the instruction pointer move and wiggle as the code is being executed!
  • Load/save support! And it autosaves when you run! And it apparently also works in the browser!
  • Hints! Find out what a certain instruction does by hovering over it with the cursor!
  • It just works! I'm surprised that it really works, and it works good!
  • You can't copy/paste code in or out! This is a nightmare!
  • Procedural sound! Instructions make little bleeps when they are being executed, and so do your keys! Doesn't seem to work in the browser! Family fun!

If you want to share your code, you can either share a screenshot, or you can copy the save file, which should be in your usual PICO-8 cart location under the name _picofunge_save.p8. Interwebz!

How to use:

All the usual ASCII characters from your keyboard work, so just poke the interpreter in any way you want!

Use arrow keys to navigate the grid. Use Backspace to erase an instruction and go back one cell, or Space to go forward.

Use Tab to quickly run code. You can also use the Tab button as an alternative for Enter in situations where you would normally use the latter, since Enter opens the pause menu.

Use Enter to enter the pause menu, in which you'll find the following options:

  • SAVE

To reload code, restart the cart. There is no LOAD button, since there are only 5 menu items available to me :(

Limitations/known bugs/quirks:

  • Backspace button doesn't work in the browser (tested in Firefox)
  • If the p instruction is used to put a nonprintable (value outside of ASCII) character in the grid, the character is displayed in a distinct way as a "glitch", it is considered data, and is not saved
  • The P key opens up the main menu, which can be sometimes annoying, but is not otherwise a problem
  • The grid is smaller than usual Befunge (it's size is 32 columns and 8 rows)
  • There is currently no support for big numbers, numbers inside the interpreter are normal PICO-8 numbers (so usual things like integer overflow can happen)
  • Small ASCII character codes assumed for letters, since PICO-8 only supports one case.

Bug reports

If you encounter any bugs or weird behaviour, please let me know either in this thread or on Twitter @szczm_. Bonus points for including a screenshot!

Source code, or "how can I make this about me"

If you have any ideas on how you could use this project, the source code is extensively documented — each function and class is explained and I tried to comment every important bit that needed explanation or description. This cart is released under a CC4-BY-NC-SA licence on this website thanks to an upload option, and this is also released on GitHub under the MIT licence. Basically, do anything you want with it, if you want to, and I'll be happy if you let me know!

Last question — why?

Please don't ask.

P#64297 2019-05-10 16:10 ( Edited 2019-05-10 16:46)

About | Contact | Updates | Terms of Use
Follow Lexaloffle:        
Generated 2019-08-18 13:59 | 0.496s | 4194k | Q:127