Tight end Eric Saubert made the game-winning two-point conversion for the Seahawks.
Seattle engineered a stunning comeback to defeat the Los Angeles Rams in extra time, securing their spot in the postseason.
Overcoming a sixteen-point hole in the final period, the Seahawks triumphed 38-37 at home, notching their fifth straight win.
While the Rams had become the first to earn a playoff spot earlier on Sunday, the Seahawks secured their place to the play-offs after a two-year hiatus.
With this outcome, the Seattle have taken over their division's race with a 12-3 record, supplanting the Los Angeles, who dropped to the number five seed with an eleven and four standing.
Quarterback Darnold had two interceptions but recovered to make two scoring throws, culminating in the tying score to wideout Jaxon Smith-Njigba in overtime.
The visitors held a six-point lead at half-time before Walker broke free for a 55-yard touchdown run for Seattle.
Los Angeles cornerback Wallace then returned Darnold's first pick for 56 yards, leading to a short score by Corum on the next play.
In the final stanza, a touchdown from Matthew Stafford to Puka Nacua extended the Rams' lead to sixteen points, but Shaheed provided the comeback with a 58-yard return for a score.
Darnold then connected with AJ Barner in the endzone, and a converted two-point play forced the contest into an extra period.
Although Nacua scored for his second TD in OT, Smith-Njigba responded in kind to setup the game-winning score.
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