Ever dreamed of being a millionaire? In the US, a mobile game called Portals is offering players the opportunity to win over a million dollars in prizes in a live event starting Oct 9.

One lucky winner will take home a US$1 million jackpot if they succeed in unlocking 25 portals on their first attempt.

For everyone else, there’s an additional US$250,000 up for grabs in other prizes.

More prizes up for grabs

The aim of the game is simple. At each level, players have a choice of two keys to open a portal.

The right key opens the door to a new world while the wrong key takes players back to the beginning.

The contest features 25 portals to unlock. The first player to unlock all 25 correctly on their first attempt will bag the top prize of US$1 million.

The next 20 players to succeed can claim a prize of $10,000 each, making an additional US$200,000 up for grabs.

And the competition doesn’t stop there, because smaller prizes with a total value of US$50,000 will be available to win over the course of the game.

The event ends Saturday, Oct 10 at 10PM EST.

While the Press Play Slots app is free to download, it is only available to US residents aged 18 and over, except for those in Washington, as outlined on the game’s App Store page.

“We are flipping the script on traditional, hyper casual games,” one of the game’s founders and investors told Forbes anonymously.

“We don’t ask for any money from our users ever and there are no in-app purchases.”

The founder hopes to draw new players with the event, assuming that some of those who download the game for the competition decide to keep using the application. In a bid to reach as many people as possible, Forbes reports that YouTuber David Dobrik is set to hype the event to his 18.4 million followers.