White rice or brown rice? Black beans or pinto beans? What kind of protein? 

What may seem like a simple answer when ordering dinner can be an opportunity to win a buy-one-get-one free code for a burrito. Chipotle is giving out codes to customers who pick the correct combination each hour.

The popular Mexican fast-food restaurant will be giving over $1 million worth of free burritos ahead of National Burrito Day on April 3. 

Burrito Vault can be played on UnlockBurritoDay.com. The game will give away 157,500 buy-one-get-one free entree codes. 

Each hour, 2,500 codes will be awarded to the first people who can successfully guess a burrito order combination. The player must pick the correct combination of a Chipotle order, guessing each ingredient.  

The first person each hour who guesses the code to the vault correctly will win free burritos for a year. 

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Those who win free burritos for a year will be awarded 52 credits for regular entrees. 

The buy-one-get-one free codes are limited to one per entry. Winners can redeem that prize on April 3. 

On April 3, Chipotle rewards members can use the code DELIVER to access a $0 delivery fee when ordering. 

The contest started on March 31 at 9:00 a.m. ET and will continue until April 2 at 11:59 p.m. ET.