[Mick]

College football rivalry game corner:

1. Which Pac-12 (and legacy leagues) rivalry game has been played the most?
2. Which game has been played more: Army-Navy or Cal-Stanford?
3. Which game has been played more: Stanford-Cal, or any rivalry involving Notre Dame, Michigan, any Texas university or Alabama?
4. Which game has been played more: Montana vs. Montana State, or any rivalry involving any Texas university?
5. Which league has more rivalries of 100+ games, the SEC or the
Pac-12?

2 army navy

Stanford vs. Cal has been played 124 times; Army v. Navy has been played 122 times.  Though Army v. Navy's first game predated Stanford v. Cal by two years.

And not a full trivia question, but Stanford v. Cal has resulted in 11 ties, most of all college football rivalries.

[Mick]

College football rivalry game corner:

1. Which Pac-12 (and legacy leagues) rivalry game has been played the most?
2. Which game has been played more: Army-Navy or Cal-Stanford?
3. Which game has been played more: Stanford-Cal, or any rivalry involving Notre Dame, Michigan, any Texas university or Alabama?
4. Which game has been played more: Montana vs. Montana State, or any rivalry involving any Texas university?
5. Which league has more rivalries of 100+ games, the SEC or the
Pac-12?

2 army navy

Stanford vs. Cal has been played 124 times; Army v. Navy has been played 122 times.  Though Army v. Navy's first game predated Stanford v. Cal by two years.

And not a full trivia question, but Stanford v. Cal has resulted in 11 ties, most of all college football rivalries.