I like 6 of the 8 play mat tiles I received (I purchased 2 sets). 2 of the tiles were not very black, more brown and do not match well with the others, so I’m not using them now. Also, there is a bit of discolouration on some of the mats. See photos to see the colour difference and discolouration on the mats I received. 

That being said, the mats are durable and provide the cushioning needed for my 5 month old baby to do his tummy time in our living room. I will likely purchase more to connect to them and cross my fingers that they match the existing ones and are not brown or discoloured.