Halloween is one of the most popular days of the year for pizza delivery, and Blaze Fast-Fire’d Pizza is offering a plethora of treats to celebrate. The hot fast casual chain announced today that it will offer free delivery nationwide, available through blazepizza.com and the Blaze Pizza mobile app, and will release hundreds of Large Pizza boxes across the country that reveal a secret message under black light.

Embracing the Halloween spirit, these custom pizza boxes look just like Blaze Pizza’s standard Large Pizza boxes, but when exposed to black light, secret messages, including “Bone Appétit,” “Creepin’ it Real” and “Dare to Open” are revealed. Those that receive a black light-activated pizza box and post it to social media tagging @BlazePizza and using the hashtag #BlazeHalloweenSweeps will be entered to win a number of prizes, including:

• One (1) Grand Prize – One (1) Free Large Pizza delivered for free each week for a year, valued at $1,500, to keep the pizza party going 52 weeks straight
• One (1) First Prize  – Ten (10) Free Large Pizzas delivered for free to host a pizza party with their crew
• Ten (10) Second Prizes – One (1) Free Large Pizza

Official rules can be found here. 

“Blaze Pizza was recently ranked as ‘America’s favorite pizza chain,’ and we’re excited to upgrade Halloween parties across the country with a better delivery pizza,” said Daniela Simpson, GM, Digital Growth Division. “No frozen dough or scary processed ingredients here. Blaze Pizza is all about serving up real food this Halloween and all year long.”

Launched in September, Blaze’s new Large Pizzas are similar to its 11-inch pizzas—made with fresh dough and real ingredients—but their larger 14-inch size, cut into 8-slices, make them perfect for sharing. Large Pizzas are available exclusively online for delivery and carryout.