Online casino software providers often release slots games in series. The slots machines in a series are similar in theme and structure, but yet have their own identity. Cryptologic offers a series of three online slots, called Frightmare Slots at its online casinos like InterCasino. The titles, which are Vampire Bats, Witches and Warlocks and Zone of the Zombies, have eerie graphics and are networked to the two-tier progressive Frightmare Jackpot. The larger of the jackpots is called Monster Jackpot and the smaller is called Spooky Jackpot. Any of these progressive jackpots can be randomly awarded on any spin from any of the three slot games. There are no minimum bet requirements for hitting the jackpots, but larger wagers increase the chance of winning the jackpot.

Vampire Bats online slot has Vampire Bats as the wild symbol, which appears only on reels 2, 3 and 4. The Vampire Bats logo is the scatter symbol. The win animations in both these symbols depict vampire bats going for the kill. The other thematic symbols in Vampire Bats are the vampire, the female victim, the gravestone, the candles and the broken mirror. Some of the thematic symbols ward off vampire attacks and include the cross, the holy water and the garlic. Players will not mind which of these symbols appear on the reels as long as the payouts are good. The Frightmare Slots Vampire Bats has a special Re-Spin Feature. Four re-spins are awarded to the player when the Vampire Bats symbol appears simultaneously on reels 2 and 4. These reels are held and the remaining reels are spun again.

The Witches and Warlocks Frightmare Slots game offers a contest between the witches and the warlocks. The Warlock is the wild symbol and the Witch is the scatter symbol. The other thematic symbols in this slot machine are the cauldron, the potions, the crystal ball, the cat, the skull, the pumpkin, the spell book, the broom and the witch’s hat. The battle of the sexes is played out in the Witches and Warlocks feature, which is triggered when three Witch symbols appear scattered on the reels. The player has to choose either a witch or a warlock. The two then slug it out using spells and potions. Prizes are awarded for each move made. The witch and the warlock have their individual Life Meters that keeps diminishing due to the attacks. If the player’s character wins then there is a bonus prize depending on the Life Meter reading.

The last of the Frightmare Slots, Zone of the Zombies is the most gruesome. The Zombie is the wild symbol and the Hero who fights against the zombies is the scatter symbol. The other thematic symbols are the female victim, the chopped limbs, the bloody eyeball, the mace, the werewolf, the machine gun and the armored tank. The special feature in this Cryptologic slot game is the Zombie Feature. It is triggered when three or more scattered Hero symbols appear anywhere on the reels. The Hero has to defeat five Zombies to reach the police station. Random bonuses are awarded for each Zombie killed. An additional bonus is awarded if the Hero gets to the police station. If any Zombie kills the Hero the bonus feature is aborted midway.