Scratch

are you talking about a sprite mouse? or the mouse you use to control your cursor? i am just going to assume your talking about the sprite mouse. lets first do your problem about the mouse moving, if your script is something on the lines of:
[blocks]<when green flag clicked>
           <forever>
           <move( 1 )steps>
           <end>[/blocks]
without any ifs or "wait until" blocks before the move, then it will move. i suggest something along the lines of:

[blocks]<when green flag clicked>
            <forever>
              <if><key[ up arrow ]pressed?>
              <point in direction( 0 )>
              <move( 1 )steps>
              <end>
             <end>[/blocks]

that way, you will have to press the arrow to get it to move.

now, for the touching yellow blocks there are two ways, the first, make the blocks/line a sprite, and do this: (note: this should be on the block's script)
[blocks]<when green flag clicked>
           <forever>
            <if><touching[ sprite1]
            <go to x   wherever your )y   starting point is )>
            <end>
           <end>[/blocks]
ooor
[blocks] <forever>
             <if> <touching color[ use dropper to get exact shade ]
             <go to x   starting )y   point )>
             <end>
            <end>[/blocks]
hope i helped

How about is he is using the mouse for controll?
[blockes]
<when green flag clicked>
<point in direction( mouse
<move(  )steps>
[/blocks]

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johnny2011, please post a new topic to get more replies. Thanks!