Top 15 and I'm dating myself here. Northwestern has been involved in so many nail biting, high drama games it's hard to narrow it down. Also added some NIU games as they are my 1B team.
11/4/2000 NU beating Michigan at home in a nail biter 54-51 which was instrumental in the Cats winning their most recent Big 10 Co Championship. The last team with the ball won the game and that was the Cats.
2004 had terrific games
a)9/2/04 rarely do you see a high scoring closely played game in a non conference opener but that's exactly what happened when the Cats played TCU. Lead changed hands several times, tieing at the end of regulation at 45. TCU won in OT 48-45
b) 10/2/04 Cats Beat Ohio State 33-28 in one of their few wins over the Bucks. It was a night game with an electric atmosphere.
2005 games
9/10 NU outlasting NIU 38-37 in Evanston. NIU tied the game with less than 10 seconds left and went for 2 on the last play of game. The conversion failed and the Cars hung on!
10/8, the only night home game that year, Cats outlasted Wisky 51-48, another game with no defense and last team with the ball wins.
10/13/07 the Cats pulling out an OT home win over Minnesota by 49-48.
11/15/2008 The Cars stunning Michigan in the Big House 21-14. First Cats road win in the Big House since the 95-96 glory days.
2009
11/21 Cats nosing out 33-31 Wisky to take their regular season finale and their 8th win
1/1/10 Cats put up a valiant effort in the OUtback Bowl vs Auburn but came up short in OT 35-38. A heart pounding game.
10/29/11 Cats beating Nebraska on a last play of the game TD to pull out a road win 28-25. which NU needed to become bowl eligible (6-6)
2012
9/1 Another rare nail biter in a season opening non conference game, the Cars hung on to beat Syracuse 42-41.
10/20 Nebraska beat the Cats on the final play of this game 29-28 in Evanston.
11/15/14, Jack Mitchell a walk on kicker who also played OF on the baseball team, nails 3 Field Goals including a last play of Regulation to tie the game at 40 and then the game winner in OT to beat Notre in South Bend. This was the first game played between the programs in almost 20 years. Beating ND in south Bend was sweet solace after losing at home to Michigan the previous week 9-10.
8/28/2003 NIU beating Maryland in OT in DeKalb 20-13, first NIU win over a P5 program at home
9/20/2003 NIU beating Alabama 19-16, a real nail biting back and forth game and while this was one of the worst Alabama teams, they were ranked when the game was played and given their success since then it was a heck of a win.
The series that NIU has had with Iowa, as the recent games have been very closely contested NIU winning 30-27 on 8/31/13 the year the Huskies went to the Orange Bowl, On 9/1/12 Iowa beat NIU 18-17.