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It’s the biggest weekend in college football and Missouri sports betting is officially underway.

Of the nine Missouri sportsbooks that went live this week, Underdog Fantasy is available for Daily Fantasy Sports (DFS) action. Show Me State bettors can use the Underdog fantasy promo codeNYPOST for $100 in bonus value — one of several Missouri sportsbook promos out there.

There are four FBS conference championships Friday night to sign up for Underdog, but the biggest game of the weekend will be Saturday at 8 p.m. ET between No. 1 Ohio State and No. 2 Indiana in the Big Ten title game.

If you’re within state lines, the Underdog fantasy promo codeNYPOST can be used for a welcome bonus: Play $5, get $100 in bonus entries.

Thank of bonus entries like site credit. You can use them to place entries and win real money, but you cannot withdraw them.

Want updates on the latest that’s happening with Missouri’s sports betting launch? Follow the NYPost’s live blog for everything from the best offers and up to the minute news.

Ohio State’s defense has been a fortress all season, giving up just 7.8 points per game, and it now meets an Indiana attack humming at 44.3 points per outing in a true strength-on-strength collision.

Julian Sayin enters Indy off a crisp three-touchdown day against Michigan, while Fernando Mendoza counters with a streak of mistake-free efficiency that fueled Indiana’s 56-3 rivalry rout.

Roman Hemby’s 12.7 yards per carry against Purdue adds a volatile big-play element that could stress even the nation’s top scoring defense.

History tilts hard toward the Buckeyes — Indiana hasn’t beaten them since 1988 — but this marks the first Big Ten title game featuring two unbeaten teams, with both quarterbacks sitting atop the Heisman race.

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Sean Treppedi handicaps the NFL, NHL, MLB and college football for the New York Post. He primarily focuses on picks that reflect market value while tracking trends to mitigate risk.