About this app
About Haunted Harbor
The game is backed by a solid mathematical model, with a Return to Player (RTP) of 96.01%. That figure sits within the standard band for mainstream slots. In other words, this is steady core content rather than a high-volatility outlier.
The central hook is how PopOK layers a multiplier system onto such a small grid. A fourth reel applies multipliers ranging from 1x to 15x, increasing the value of connected wins.
The more distinctive element is the Ultra Bet feature. It gives players a stake-based lever over that engine. Ultra Bet removes the lowest value from the reel to improve the chances of landing higher multipliers.
What is Haunted Harbor?
City of Detroit to investigate water tower with Polymarket logo https://t.co/O2n852pQxy
Polymarket and other prediction markets that ventured into sports trading last year maintain that they’re financial platforms governed by federal law.
The Commodity Futures Trading Commission (CFTC) agrees, continuing to defend its claimed “exclusive jurisdiction” over sports prediction markets in federal and state courts across the nation.
How to play Haunted Harbor
The two companies began collaborating in November 2025. As part of the deal, Polymarket provided data for a dedicated prediction market section on Yahoo Finance. The feature provided market-based probabilities of economic, political, and financial developments alongside Yahoo Finance content.
The Yahoo Finance prediction market section was taken out in April. The companies have now confirmed that the larger deal is also off, as reported by Bloomberg.
Yahoo said Polymarket is still an advertising partner and suggested the two could collaborate on other projects in the future. Polymarket has not provided any public explanation for the end of the data partnership.
