We do the sport of K9 Nosework, and so routinely I do lots of hides in the house (and outside - and of course we go to different locations too -- but in bad weather, we just work in the house). Doing searches is a wonderful way to "exercise" a dog mentally. And - it's fun!
Start simply - hide something in a really simple spot and ask Rory to find it. When he does, YEA!! Do it again, make the first few times really simple - so that 1), he 'gets' the game, and 2)he easily finds his reward (and hide something he really loves - or, give him a little treat when he finds whatever you're hiding. Then start hiding 'it' a bit harder and harder, and let him go. As the hides get harder, and he really has to search using only his nose, he will get tired. They go into true 'hunt' mode, it takes them back to basics - and they do get tired. I'll do ~10 searches with each of mine (using essential oils) and they both just come flop for a while when they're finished.
Long before we got into Nosework, I used to play "find it" with my old boy Sherman. He was obsessed with his tennis ball and carried it everywhere with him. He'd bug me around 9pm when I was relaxing, reading or watching tv - so I started playing "find it" with him (cuz I sure wasn't going to go play ball!). I found he LOVED searching for his tennis ball! I'd hide it all over the place, and he'd search and search. We'd play ~10 times, and he'd finally go lay down, pooped!
We did it almost every single night for years. Try it - you might like it.