In the game the player must guide the dragon through the land flying towards the right, and fight its way through a multitude of enemies, both humans and fantasy creatures: sea snakes, giant spiders, a hostile two-headed dragon. They can be burned with the dragon's fiery breath, or they can be grabbed with the dragon's claws and dropped onto other enemies. Boulders can also be picked up and dropped on enemies. To win the game, the dragon's mission is to pick up an enchantress for a ride, then safely deliver her to find a book of spells, and finally take her to a magic cauldron so she may cast her spell. The enchantress brings extra challenge to the task, as she must be kept safe from harm. If Thanatos turns around too fast while flying, she may fall off and must be picked up again. If the sorceress is slain or Thanatos dies, the game will end.
The dragon makes its way through a few strongholds, whose gates must be burned through (apparently the castle walls are too tall to fly over). If the dragon runs out of fire breath, it must backtrack to find a virgin strapped to a pole, land nearby, and walk closer to eat the virgin. This will restore the dragon's breath. However, be wary as a knight is waiting in ambush and attacks the dragon while it's landed and vulnerable.
The dragon's health is indicated by a beating heart in the bottom of the screen. As the dragon takes hits from enemies the heart starts beating faster and faster, and near death it starts flashing blue. The dragon must withdraw to safety to rest and recover.