Last month, PopCap Games, the makers of Plants vs. Zombies, teamed up with the American Dental Association to “stop zombie mouth.” The campaign distributed over 1 million Plants vs. Zombies trading cards and educated kids on the importance of dental hygiene. Along with the trading cards, PopCap was giving away copies of Plants vs. Zombies for free with a redeemable coupon code.

Evidently, giving away one of the most popular tower defense games of the past few years proved a success. Over 250,000 copies of the game were distributed, and PopCap has announced it is extending the deadline to redeem the coupon codes to November 13.

“The Stop Zombie campaign was a tremendous success using a unique platform to improve the oral health literacy of entire families,” said Dr. Jonathan Shenkin, ADA spokesperson on pediatric dentistry. “The American Dental Association looks forward to future innovative collaborations that enable us to realize the goal of reducing oral health disparities.”

The goal of the campaign was for adults to print out the coupons and give them out instead of candy on Halloween. As bad as that decision sounds, a PopCap survey shows that 93% of kids would take a free video game over candy on Halloween night. Of course, survey also shows that 89% of kids would still like Halloween if it were less about candy and more about “other types of fun.” Someone should explain to kids that other types of Halloween fun are for grownups, and that they should gorge on free candy play Plants vs. Zombies and brush their teeth while they can.