Hi, im butterking829. This how to make 3D games.
Look at these blocks:

change size by (10)

when green flag clicked
set size to (100) %

Now these are very simple blocks. Take a look at THESE simple blocks:

move (10) steps

move (-10) steps

You can make it so these blocks will affect every time you press a key. for example:

when [up arrow] key pressed

move (10) steps

Still dont understand? Head over to this project :http://scratch.mit.edu/projects/16850975/#player to see how this works. Thanks for reading this post. Tell me if its helpful in the comments below.

I don't really see how that is “3D”…

i think it is easier when you do this

when green flag clicked
forever
    
if <key [any key u want v] pressed?> then
    
clear
turn left (4) degrees
stamp
change y by (1)
stamp
change y by (1)
end
end

repeat the stamp change y by one thing 10 to 15 times

Got exactly what you meant… And this is rather rough.

I've made something similar to this back in Scratch 1.4 glory days.

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omg… sweet.. Third Dimension! OVER HERE!!!!!!!!!!!!

Hmm I have never tried it. Omg the projects are new going to be in 3d. That is crazy!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!