We have one that we got at Wal-mart. She loves it and an walk on the carpet. I'd say we have medium...pile? Is that what's it called? Anywho she's had it for about 5 months and hasn't died. It works well outside on the porch and driveway in the summer.
We have a baby trend one (I think?) that my aunt said ds "needed." It works better on our hardwood and laminate flooring, but it does work on carpeting (just not as easily).
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I have the Baby Trend one with the teddy bears too. I saw it today at BRU for $39.99 and bought it from a shop called Kid to Kid (like consignment) for $15.99. DD loves it, we have a very long pile carpet and she gets a little frustrated but then she is just getting used to it. I think it could work on carpet but it's not as easy.
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Im not sure what the name is but ours is pink and we got it from wal-mart. She has no problem going from tiles to carpet, to rugs. Even works great on rugs with different heights variations for design. Aside from being very inexpensive, the toy portion of the tray comes off for easy cleaning and sanitizing
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we've tried a few and this is the best- especially on carpet. Pricey though. And boy-ish (there's no girly one at BRU for this type.)
https://www.toysrus.com/product/index.jsp?productId=3955998
This is what I have and I love it! I've used it for both my boys.
https://www.walmart.com/ip/Bright-Starts-Doodle-Bugs-Around-We-Go-Baby-Activity-Station/12960826