Phineas and Ferb: Across the 2nd Dimension (Nintendo Wii)
Walkthrough by darkmario12 (justinbi247 | Google Mail)

This is the first walkthrough I'm doing! I'm pretty excited to be doing this!
Either way, Let's get started.

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1-1 coins 
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After the opening, you should come out in the front yard of your house in this
dimension. Walk left from where you started, and you should find coin number 1. 

When you fend off the gelatin monsters that come out of the trashcans, jump
over the fence on the far left side. Go to the corner nearest to you, and you
should find coin number 2.

When you jump from the car to the building, there should be a gap from that
building to the next. Drop down and go to the right side of the yard for coin
number 3.	

The 4th coin is simple. After landing from the Platypult launch, the fourth
coin should be to the left of you.

Near the end, a couple of spiderbots will be coming at you through some
portals. After that, a couple will be jumping out of a pit. Walk into that pit
and drop down. To your right should be the 5th coin.

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This is my first walkthrough, so I'd really appreciate it if you told me what
you think! I do look forward to doing more of these coin walkthroughs!