Wendy’s is celebrating Halloween with four days of deals to whet your appetite.

The Hallo-WEENdy’s promotion starts on Monday, October 28 and lasts until All Hallows’ Eve. This is what the hamburger chain offers:

• Monday, October 28: A buy-one-get-one deal on all breakfast sandwiches
• Tuesday, October 29: A free small chocolate Frosty with every purchase
• Wednesday October 30: A free small cup of coffee with your purchase
• Thursday, October 31: A free four-piece Saucy Nuggs. Buy the Spicy Ghost Pepper Saucy Nuggs if you dare, or choose from five other, less spicy flavors.

That’s not all: Some soft drinks are just $1 for a limited time at participating restaurants, and Wendy’s is selling Frosty Boo! Books for ten euros during the Hallo-WEENdy promotion. Boo! Books include coupons for five free Jr. Frosty treats and a $1.99 kids meal. You can also get one by purchasing a cute Boo! Bag Meal, where the children’s dessert is served in a glow-in-the-dark Bone Chiller Frosty cup.

Even sweeter: 90 cents from each Boo! The book sold will go to the Dave Thomas Foundation for Adoption to “help find forever families for children waiting in foster care.”

All Hello-WEENdy deals can be obtained through the Wendy’s app on your phone, which is a great way to earn rewards for free food. Right now, Wendy’s is offering bonus points and a free 10-pack of Saucy Nuggs to those who create a new account.