Each bet made on a specific pooled jackpot game, across multiple casinos, contributes to the top prize. Network or pooled jackpots offer the biggest prizes of all. We recommend you check out Microgaming's The Dark Knight Rises. Each bet contributes a small percentage to the top prize. These types of jackpots cover vast networks and grow each time a player bets. Progressive jackpots offer prizes millions - but they are hard to win. These are usually on the smaller side due to the smaller number of players contributing to the total and can only be won by players registered with the casino in question. Local jackpots have a prize pool that is formed exclusively by bets made by players at a particular casino. There are several types of jackpot slots, including: Local jackpots A jackpot slot is exactly what it says - a slot machine with a jackpot prize, which is the biggest potential payout.