Receiver Eric Saubert executed the game-winning two-point play for the Seahawks.
Seattle engineered a remarkable fightback to overcome the Los Angeles Rams in extra time, securing their spot in the NFL play-offs.
Overcoming a 30-14 hole in the final period, the Seahawks emerged victorious by a single point at home, notching their fifth straight win.
While the Rams had already secured a playoff berth earlier on Sunday, the Seattle team booked their return to the play-offs after a two-year absence.
With this outcome, the Seahawks have taken over their division's race with a 12-3 mark, supplanting the Rams, who fell to the fifth playoff position with an 11-4 record.
Signal-caller Darnold threw two picks but regrouped to deliver two scoring throws, including the second score to star receiver Smith-Njigba in overtime.
The Rams held a six-point advantage at the break before Walker broke free for a long scoring dash for the home side.
Rams cornerback Wallace then took back Darnold's first interception for 56 yards, leading to a short touchdown by Corum on the next play.
In the final stanza, a scoring pass from Matthew Stafford to Nacua extended the advantage to 30-14, but Rashid Shaheed ignited Seattle's hope with a spectacular return for a score.
Darnold then found Barner in the endzone, and a converted conversion sent the game into an extra period.
Although Nacua raced in for his second touchdown in overtime, Jaxon Smith-Njigba answered in kind to setup the decisive score.
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