I sometimes see red blocks being used in the Wiki.
What are those?

Red blocks are undefined blocks that don't exist, like so

blah blah blah

I see.
Thank you.

One more thing - the block plugin (what makes the blocks show up on the wiki) was updated recently, so some blocks that used to be supported only show up as undefined blocks. Ex- the “if <>” block is now the “if <> then” block, so it comes up as

if <>
. . .
end

instead of…

if <> then
. . .
end

They are undefined blocks.

undefined
undefined ::reporter
undefined ::boolean

By the way, if anyone does see a red block on the Wiki that shouldn't be red, for example an [if <> then block], then please message me. I'll make sure to fix the error. This is super helpful because it's hard to catch all incorrect red blocks, especially after the recent plugin update as @pianogirl84 mentioned.

Here are some red blocks I found in the tutorials section of the Wiki:
(Which article) - (Name of the red blocks) + (Another red block)

Extensive Scrolling Engine - if + generate blocks
Scrolling(sprites) - switch to costume
Simulating Gravity - switch to costume
Jumping - jump
Wall sensors - if
Advance Clone Usage - switch to costume
Moue-over - switch to costume
Sound On/Off Button - switch to costume
Turn Based Rpg - when i am clicked + switch to background + switch to costume
How to create a countdown - if else + if
How to Make a Title Screen and Levels - if
Creating a Main Menu - if
Creating a Quiz - “ceiling of (length of questions/5) //each group contains 1/5 of the total questions”
Detecting Turbo Mode - switch to background
Global High Scores - decode + if + encode
Grids - if else
Recursions and Fractals - forced iteration + “test legibility at R: () I: ()” + set pen color
Sorting Values - if + if else
Separating Clone and Sprite Triggers - if

Adjappositenuse wrote:

Here are some red blocks I found in the tutorials section of the Wiki:
(Which article) - (Name of the red blocks) + (Another red block)

Extensive Scrolling Engine - if + generate blocks
Scrolling(sprites) - switch to costume
Simulating Gravity - switch to costume
Jumping - jump
Wall sensors - if
Advance Clone Usage - switch to costume
Moue-over - switch to costume
Sound On/Off Button - switch to costume
Turn Based Rpg - when i am clicked + switch to background + switch to costume
How to create a countdown - if else + if
How to Make a Title Screen and Levels - if
Creating a Main Menu - if
Creating a Quiz - “ceiling of (length of questions/5) //each group contains 1/5 of the total questions”
Detecting Turbo Mode - switch to background
Global High Scores - decode + if + encode
Grids - if else
Recursions and Fractals - forced iteration + “test legibility at R: () I: ()” + set pen color
Sorting Values - if + if else
Separating Clone and Sprite Triggers - if

Wow, thanks! That'll be really helpful

Update - we've fixed all of the red scratchblocks on your list! Reporting to be closed now…