Foam letter and number tiles (Old Town SG1)

I can't remember is we had 3 or 4 packs but offering lots of foam interlocking tiles with numbers and letters

Some have indents from furniture, some have claw marks from cats, some are dirty and some look brand new

Have tried to clean a few up and the dirty ones come up ok. They mainly have dirt on the back of the tile where they had been on our lounge floor for so long