Potty training AGAIN

My MIL bought another new potty for Gordon as he still poos in his training pants. And sometimes, he gets so engrossed in his games that he'll continue playing even though he's poo-ed. I found the carpet with poo on it yesterday and whacked his bum. INSIDE THE BEDROOM. And no, this isnt the first time he's done that. It's not funny trying to get poo out from the carpet, okay. It's really shitty, geddit. He does have his own potty inside the bathroom. Just that he doesnt like to sit on that. Only pees in it. Hope he'll get the drift and learns to poo in the new potty. It's in my favorite color though.... damn.