In the non-contiguous states the only game that an OSU fan would routinely circle before the season starts would be Wisconsin.
It should be Nebraska, but if they're your fixed crossover for six years and nobody even notices, then there's just nothing there unfortunately.
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Penn State would love to have Nebraska on the annual, because they are completely screwed from a rivalry standpoint. Traditionally it's Pitt, but unless Pitt joins the Big Ten they'd be much more inclinded to rekindle the backyard brawl than PSU imo, because they'd be more likely to win that game at least 50% of the time.
Obviously the Big Ten tried to throw PSU a bone by bringing in two of their traditional annual opponents in Rutgers and Maryland, but Penn State doesn't want to get blamed for them being in the Big Ten, so they overcompensate by adamantly insisting that neither is a rival of any sort.
They want the OSU rivalry real bad because it's all they have, but OSU likes to troll them by saying it's not a rivalry. PSU fans are like "we're in neighboring states, we're both good, we're in the same division, we've played every year since the 90s, our game often decides the conference title, what more do you want?" and OSU fans are just like "yeah that might work for you, but we like to have a little tradition in addition to all of those other things."
They don't even try with Michigan. They sized them up on day one, and said "yeah, they already have three rivals. We're not getting in on any of that."
Then there's the Michigan State thing, but that's just ridiculous.