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Archive.png This article or section documents something not included in the current version of Scratch (3.0). It is only useful from a historical perspective.

Experimental blocks were blocks that were experimental and unofficial, and did not appear in the Block Palette. They were available from Scratch 1.0 through 1.2 and 2.0. In 1.0, they were accessed by shift-clicking the Extras menu and choosing "show experimental blocks"; in 1.1 and 1.2, through Shift-Click-R. They are similar to the Motor Blocks, which are also not displayed by default; however, the Motor blocks are fully functional.

Sound Blocks

The 13 experimental Sound blocks.

There were 13 experimental Sound Blocks. All were Stack-shaped. They were:

  • start movie::sound
  • stop movie::sound
  • change seconds by (1)::sound
  • set seconds to (0)::sound
  • change zoom by (10)::sound
  • set zoom to (100) %::sound
  • change horiz. pan by (10)::sound
  • set horiz. pan to (0)::sound
  • change vert. pan by (10)::sound
  • set vert. pan to (0)::sound
  • change fade by (10)::sound
  • set fade to (100) %::sound
  • set fade color to [#000000]::sound

The fade blocks were later changed to say "trans." (short for "transparent")[problematic].

These blocks were likely for use with the Scratch MoviePlayerMorph.

Sensing Blocks

The 9 experimental Sensing blocks

There were 9 experimental Sensing Blocks. 6 were Reporter Blocks, and 3 were Stacks. They were:

  • (camera motion::sensing)
  • (camera direction::sensing)
  • (camera relative x::sensing)
  • (camera relative y::sensing)
  • (camera absolute x::sensing)
  • (camera absolute y::sensing)
  • track motion::sensing
  • track color::sensing
  • auto calibrate red::sensing
The readouts of the reporter blocks, all showing "a ScratchSpriteMorph()".

These blocks appear to be intended for camera sensing, but in all versions of Scratch that include them, they do not work and their stage monitors simply display "a ScratchSpriteMorph()". True camera support was later added in Scratch 2.0.

Experimental Blocks in 2.0

Scratch 2.0 contains 5 extra experimental blocks not available through normal means. In alpha versions, these blocks used to be a yellow-green color. The counter blocks were introduced in the very first Scratch 2.0 (prealpha) versions, and "While ()" and "For Each () in ()" were introduced in v138.[1] 1 is a reporter, 2 are stacks, and the other 2 are C Blocks. The experimental blocks are still present in Scratch 3.0. They are:

  • (counter :: control) (called "noop" due to 2 copies of the block spec[citation needed], fixed in Scratch 3.0)
  • clear counter :: control
  • increment counter :: control
  • while <> {
    } @loopArrow :: control
  • for each [ v] in () {
    } @loopArrow :: control

The Counter reporter block reports the value how many times the "Incr Counter" block is used. If "Clear Counter" is used, the value resets to 0.

The Clear Counter block resets the counter value to 0.

The Increment Counter block increases the counter value by 1.

The While () C block makes blocks held inside this block loop until the specified boolean statement is false, which works like a Repeat Until (Not ()) block.[2]

The For Each () in () C block works like the Repeat () C block, except a variable that counts up each time the stack ran. For some reason, if you make a variable, a variable and the variable blocks will appear, but because of an error, there are no variable choices in the block. Also, another error; the number uses a string input instead of a number input. Those errors have been fixed in Scratch 3.0.[3]


Because of the 5 blocks' straightforward function, all of those can be replicated with the following codes:


(counter) // Using a variable

Clear Counter

set [counter v] to [0]

Increment Counter

change [counter v] by (1)

While ()

repeat until <not <. . . :: grey>>
. . .

For Each () in ()

set [i v] to [0]
repeat (. . . :: grey)
change [i v] by (1)
. . .

See Also


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