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Yes, you totally should feed your grundos! You don't have to, but after a while it gives you the sad face and it makes you feel guilty! But, yes, they are neopets too, and you should feed them.
At the grundo warehouse, located at the virtupets space station
The rainbow pool http://www.neopets.com/pool/ will tell you what colors each neopet can be painted.
Grundo were once a peaceful people until they were enslaved by Dr Sloth. This should explain http://www.neopets.com/space/comic.phtml
I assume your asking about the Grundo Warehouse, where you can put in a rare item code that will give you a virtual item. This is located next to the Grundo Adoption Agency in the ''Space Station''. Which is in the top right corner of the EXPLORE map.
Each Virtual Prize Code is unique to everyone. There are some that can be used by all, which are the Facebook freebies and to get the avatar. To get a Yooyuball Stuck in a Tree, enter Yooyuball2011 at the Grundo Warehouse. Everyone can use this code.
That requires a code from real life neopets merchandise.
no not really you can get them at the space station
You buy from the Neostore or you pay real cash (real life).
Neopets are a free game online. You can buy items such as cards, plushes, neocash cards, and items supporting neopets. You do not need a code to get on neopets. just make an account, get neopets and play. Purchasing is only extra.
While purchasing at the runners warehouse with a coupon, you do have to have a discount code. The code determines if the coupon is valid or not. Without this code, your purchase will not go through.
No I have tried that code and it did not work.