We have carpet in our home and currently have the multi-piece interlocking foam alphabet/numbers set in LO's playroom. It seemed fine at first, but now that we've been using it for a few months, the letters/numbers/borders keep lifting or she will pull them out. Having to straighten it up and put the pieces back in everyday is starting to get annoying.

Does anyone know where I can find a foam floor mat that is in 1 piece and can be rolled up for easier storage? I could have sworn I saw one in a Toys R Us ad awhile back, but I didn't see anything on the website when I looked just now. I've also checked Amazon and didn't see anything on there either. Thank you!