Just made the bottom 12" tier of a grad cake and I used this recipe:
1 (18 1/4 ounce) package yellow cake mix
1 cup sour cream
1/3 cup vegetable oil
1/4 cup water
1/4 cup sugar
4 large eggs
1 teaspoon vanilla extract
It came out perfectly, but I realized as I'm making the middle tier that I forgot the sugar!!! 
Did I ruin this layer? Do I have to re-make it? Will the frosting make it sweet enough? Please HELP I'm freaking out! Thanks!
Oh My Gosh. I don't know. Is it done baking? try tasting a little piece, like what you will be cutting off to level it.
Hopefully someone else can help!
1/4 cup shouldn't be that big of a deal, I think, especially if you are starting with a cake mix in the first place. If you need to level it, take a piece from that....or cut off a sliver to taste. Go from there...with frosting maybe it'll be okay.
Best of luck to ya!! 
The cake mix has sugar in it. The directions on the box do not require any additional sugar and the extra amount you were to add was really not that much. While I can't say for sure, I would think you should be okay. Not everyone likes a super sweet cake anyway. If you could find a little piect to sample, I would say try it, but don't worry too much.
tell us how it turned out... would be good to know.
Thanks so much! The killer of it is is that it came out perfectly level, and it looks great (I doubled the recipe and made a 12" x 3"). I was worried because of the sour cream, but I trust you guys and really value your opinions. Thanks for talking me off the ledge. I use buttercream dream, which isn't too sweet but I think it should be sweet enough to counteract the s. cream, especially if I tort into 3 or 4 layers. OK-breathing now!!!
UPDATE: OK so I chickened out and made another layer to replace the original one, and had six kids make cakeballs with the it. Verdict: It was a waste of time to rebake the layer. The kids all loved it, even though I forgot the sugar. I asked for advice and I didn't follow it. Shame on me-I should have trusted the cake divas instead of giving in to paranoia. Lesson learned!
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