HP video games. I don't even know how many times I played through PoA and never got bored of it. I was really obsessed with finding all the secrets over and over again and completing the chocolate frog card collection. I mean repeatedly hearing "rictusempra" got a little annoying sometimes, but it's still the best video game I ever owned. xD
I've also really enjoyed the Fantastic Beasts mobile game, even though it's one of those object finding games I'm terrible at. I think the stories/cases are pretty entertaining on their own.