User Guide

75
Fitting the Blocks Together
Scratch uses the color and shape of blocks to indicate how they
can be connected to each other. Blocks with a curved top, such
as the when <green flag> clicked block, are the start of a script
and can only have blocks connected underneath them.
Figure 3. You can only snap in blocks below this one, not above.
A notch in the top of a block indicates that it can be attached to
blocks above it. A tab on the bottom indicates that you can snap
other blocks into position below it.
Figure 4. A block that allows other blocks to be connected on top, or underneath.
An eight-sided white box in the block means that you can type
numbers in there, but also that you can add variables and blocks
from the Operators section of the Blocks Palette.
To use an operator or variable block instead of a number:
• Drag an eight-sided block from the Blocks Palette,
into the Scripts Area, and over the white box.
Some blocks have square boxes that you can type in. These
accept numbers, strings (sequences of characters), variables, and
eight-sided operator blocks.
Remove a block, a series of
connected blocks, or a script from
the project
In the Scripts Area, click the first
block that you want to remove and
drag it over to the Blocks Palette.
Duplicate a block, a series of
connected blocks, or a script
In the Scripts Area, right-click the
first block in the series that you
want to copy, click duplicate, and
then click in the Scripts Area to
position the new blocks.
To Do This