Scratch

well i'm making this game where there a loads of different shapes moving about everywhere but you have to catch the circle in under 60 seconds. i have already made the backgrounds for the different levels however i cannot make the levels work because they keep clashing with each other. here's what i have done for the first level...

when 
space ▼
 key pressed
repeat until 
key 
up arrow ▼
 pressed?
glide 
1
 secs to x : 
200
 y : 
129
wait 
0.1
 secs
glide 
1
 secs to x : 
37
 y : 
129
wait 
0.1
 secs

for the second level i have done...

when 
up arrow ▼
 key pressed
repeat until 
key 
down arrow ▼
 pressed?
glide 
0.5
 secs to x : 
200
 y : 
129
wait 
0.1
 secs
glide 
0.5
 secs to x : 
37
 y : 
129
wait 
0.1
 secs

please help me, how do you stop them from clashing with each other??