Underdog Promo Code GDC | Underdog Review 2026

At Underdog, there are four ways to play: Predictions, Pick ‘Em, Drafts, and Champions. 

Within these modes, markets in the following sports and esports are available: 

• NBA
• NFL
• Boxing
• MMA
• NHL
• Tennis
• Soccer
• Counter-Strike
• Esports
• Basketball
• NHRA
• PGA
• FIFA
• League of Legends
• BareKnuckle
• BYB Extreme
• Valorant
• Dota 2
• Golf
• Racing 
• PFL
• LAX
• CFL
• NPB
• Cricket
• Aussie Rules Football
• USAC Racing

Everything listed above, from golf through USAC Racing, wasn’t available at the time of this review, but it does become available at various times throughout the year.

To create an account at Underdog while using our promo code GDC, follow these steps:

1. Click our exclusive link. 
2. Click “Sign Up” in the upper right corner. 
3. Create a username. 
4. Provide your email.
5. Create a password. 
6. Input your date of birth.
7. Provide promo code: GDC. 
8. Agree to the terms and conditions. 
9. Click “Sign Up.” 

After you sign up and deposit at least $10, play $5 in fantasy entries to receive $75 in fantasy bonus entries.

As mentioned, Underdog offers four types of games: Predictions, Pick ‘Em, Champions, and Drafts. These aren’t all available in all 40 states and Washington, D.C. However, there’s at least one game mode available in each. 

Let’s check them out below. 

Predictions

Available: Alabama, Alaska, Arkansas, California, D.C., Florida, Georgia, Idaho, Indiana, Kansas, Maine, Minnesota, Missouri, Nebraska, New Mexico, North Dakota, Oklahoma, Oregon, Rhode Island, South Carolina, South Dakota, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming

With Predictions, you’ll forecast the outcomes of games or player performances. For example, you might predict which team will win a matchup or whether a player will reach a certain stat threshold. Each correct prediction earns points, and your goal is to score more points than other players in the contest to win prizes.

Pick ‘Em

Available: Alaska, Georgia, Indiana, Minnesota, Nebraska, New Mexico, North Dakota, Oklahoma, Oregon, Rhode Island, South Carolina, South Dakota, Texas, Utah, Wisconsin

With the Pick ‘Em games, you’ll build a two-to-five leg parlay selecting “Higher” or “Lower” on various player props. For example, an NFL quarterback could have a line of 249.5 passing yards; you’ll pick higher or lower, and that’ll be your first leg. The payout is higher the more legs you add. All legs of the build must succeed for you to win. 

Champions

Available: Alabama, Arizona, Arkansas, California, Colorado, D.C., Delaware, Florida, Illinois, Kansas, Kentucky, Massachusetts, Mississippi, Missouri, New Hampshire, North Carolina, Tennessee, Vermont, Virginia, West Virginia, Wyoming

Champions is a fantasy sports game where you’ll create a roster using two to eight players. Like Pick ‘Em, you’ll pick athletes based on whether you think they’ll go “Higher” or “Lower” than the line provided. 

You’ll then submit your lineup to a tournament to compete against other players. 

Drafts

Available: Alabama, Alaska, Arizona, Arkansas, California, Colorado, Delaware, Florida, Georgia, Illinois, Indiana, Kansas, Kentucky, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Nebraska, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington D.C., West Virginia, Wisconsin, Wyoming

With Drafts, you’ll build a roster of players from the sport, and the goal is to rack up points and win. For example, in the NFL, your lineup will consist of a quarterback, a running back, two wide receivers, one flex, and one tight end. Each sport has its own scoring rules. You’ll win prizes based on the number of points you score and the contest's parameters (top finishers).

The Underdog mobile app is fantastic. I downloaded it from the Apple App Store, and upon opening it, you’ll see everything you need to navigate the platform front and center.

Along the bottom, there’s a menu to navigate between the game modes available in your state, the refer-a-friend bonus, a menu to track your players, and your account. 

The account page has everything you need, including your withdrawal balance, bonus cash, promotions, available payment methods, customer support, and more. 

Back on the homepage of the game modes, you’ll see a button in the upper left to view the available sports. To the right, you’ll find a link to the available promotions next to where you’ll make your deposit. 

On mobile, you can immediately make deposits with Apple Pay, which is highly efficient. 

I don’t really have anything negative to say about the app. It functions well, and there’s no lagging or buffering between pages. This is a top-tier app among the DFS sites and apps in the States. 

First, tap or click one of our “Play Now” links on this page and follow the steps to create your Underdog account. Then, to download the Underdog app, follow the steps below. I’ll cover the Apple App and Google Play Store. This app is free to download.

Apple App Store

1. Open the Apple App Store. 
2. Search “Underdog Sports.” 
3. Click Get and confirm the download. 

Google Play Store

1. Open the Google Play Store on your device. 
2. Search “Underdog Sports.” 
3. Select Install and follow the instructions. 

In addition to encryption for logging in and completing payments, Underdog partnered with Sift earlier this year. Sift is an end-to-end fraud protection platform that helps safeguard transactions. This program also alerts Underdog in the event of a high-risk transaction. 
On the player side, there’s a transaction history you can look through to see your gaming habits.

Underdog provides players with direct links and contact information to various responsible gambling resources, including state-specific organizations. 

There’s also information regarding individual state limits. For example, you can only deposit $1,000 in Massachusetts over 31 days. 

On the Account page on the mobile app, there’s a Responsible Gaming Limits page which allows you to set limits on monthly deposits, single entry fees, a cool-off period, self-exclusion, and more.