Captain Broadside was the sole Michigan-only title, while the catalogue reached 4,496 games.
The September leaderboard was based on individual players across both states, with Lightning Link Tiki Fire debuting at No. 2.
Four biweekly sweepstakes will send online winners to a Dec. 12 Florida final with a $1 million top prize.
The latest catalogue refresh lifts the operator’s listed libraries to 4,398 titles in Michigan and 4,718 in New Jersey.
The Aug. 12 prize on Ultimate Fire Link Cash Falls China Street was the operator’s second-largest Michigan Mega payout.
A $5 deposit and qualifying wager unlock the welcome offer, with no odds cap or promo code required.
Players can get one free entry, then earn more by wagering on Octoplay slots, with Break More Piggy Banks counting double.
The promotion also offers $250,000 in New Jersey and 5 million Online Unity Points in each state.
The rollout included two state-specific titles, with 3 Shooting Stars set to stay exclusive through Sept. 24.
The latest library refresh also lifted Michigan to 4,378 titles, while new games went live in New Jersey too.
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