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This is a much better example showing how to use expressions in conjunction with the Create Object command than the one I had posted in this thread: http://www.clickteam.com/epicenter/ubbthreads.php?ubb=showflat&Number=228410#Post2284 10 It's a lot simpler and doesn't use an active for a spawn location, just positioning objects as you create them.
It also shows how you can create levels and objects during runtime, in addition to changing the level size.
Here's a more real world example to add to what I posted above. It's a simple breakout game where the blocks are created using a fastloop. When the blocks are destroyed, run the fastloop again. Runs the game in one frame, instead of using multiple frames for levels. It's very simple and I created it for people who aren't as advanced. The concept can be built upon and expanded, so it's a starting point.
http://dl.dropbox.com/u/25137857/MMF2/Fastloop%20Breakout.mfa