MAPPING : How to make minefield in map.

Hey guys,
In this tutorials i'm going to be showing you how to make minefield so that when someone steps on it,BOOM he dies x( :D.
Now place Trigger_Multiple where you want your minefield.
http://s19.postimage.org/wgdejbhzn/Untitled.jpg
Press N and put these keys and values

key = targetname
value = minefield

http://s19.postimage.org/6m3ltjhzn/Untitled.jpg

And this is it :)
Save the map.
Compile it and have fun.

You must be good at mapping.You know everything :D