Register for a new DFS account today with the Underdog promo code TOPACTION to secure a unique $100 welcome bonus. Simply create your account, play $5+ at Underdog, and get $100 in bonus funds or $100 in entries. Play your first entry or utilize your bonus funds to play entries on Steelers vs. Bengals Thursday Night Football tonight at 8:15 p.m. ET.
Get started with the Underdog promo code TOPACTION by clicking on the sign-up module below:
With the unique structure of this sign-up bonus, you have a 50% chance at receiving $100 in bonus funds and a 50% chance at receiving 10 $10 entries. We explain how this offer works in detail in future sections. Check out the chart below for more information about the Underdog Fantasy promo code TOPACTION offer and which states you can claim it in.
Underdog Promo Offer | DFS States Available | Underdog Promo Code Sign-Up Link |
---|---|---|
Play $5, Get $100 in Bonus Funds or Entries | AL, AK, AR, DC, FL, GA, IL, IN, KS, ME, MS, MN, NE, NM, NC, ND, OK, OR, RI, SC, SD, TX, VT, VA, UT, WI, WY | TOPACTION |
Underdog Promo Code TOPACTION: Get $100 Bonus for Steelers vs. Bengals TNF Tonight
The Underdog promo code TOPACTION provides new users with a $100 bonus in advance of Steelers vs. Bengals Thursday Night Football today. Play $5+ at Underdog and get $100 in bonus funds or $100 in entries. Remember, you have an equal chance at getting each bonus format and it is randomly decided by Underdog.
Let's discuss how entries work at Underdog. There are two different ways to place an entry: Standard and Flex. A Standard entry requires you to win all of your picks to receive the largest potential payout, while a Flex entry yields a smaller payout if you go perfect and an even smaller payout than that if you lose just one pick.
Here is a look at a Standard entry I created for Thursday Night Football that has a 5.5x payout multiplier.
- Aaron Rodgers Higher Than 220.5 Passing Yards
- Jaylen Warren Higher Than 49.5 Rushing Yards
- Chase Brown Lower Than 44.5 Rushing Yards
Suppose I place this entry as my $5 initial entry with the Underdog promo code TOPACTION. Here is what I receive based on the outcome of it:
- If all of my picks win, I receive a $27.50 total payout ($22.50 profit + $5 entry back) and $100 in bonus funds or entries.
- If one or more of my picks lose, I receive $100 in bonus funds or entries.
Underdog Promo Sign-Up Steps: Thursday, October 16, 2025
Use the steps outlined below to claim your $100 bonus with the Underdog Fantasy promo code TOPACTION today:
- Step 1: Click this link or any sign-up module on this page to download the Underdog app.
- Step 2: Create a username and password.
- Step 3: Fill in your email, date of birth, and all other required personal information to create a new Underdog account.
- Step 4: Enter the Underdog promo code TOPACTION and play a $5+ entry to get $100 in bonus cash.
- Step 5: Agree to the Underdog Terms of Use and Privacy Policy.
- Step 6: Click "Sign Up."
- Step 7: Make your first deposit of $10+.
- Step 8: Create your first entry at Underdog with picks from Steelers vs. Bengals Thursday Night Football.
Must be 18+ (19+ in AL, NE; 19+ in CO for some games; 21+ in AZ, MA, and VA) and present in a state where Underdog operates. Terms apply. Offer not valid in MD, MI, NY, OH, and PA. Concerned with your play? Call 1-800-GAMBLER or visit www.ncpgambling.org; NY: Call the 24/7 HOPEline at 1-877-8-HOPENY or Text HOPENY (467369)" with "Must be 18+ (21+ MA & AZ, 19+ AL, NE) and present in a state where Underdog operates. subject to change. Terms apply."