Deadly Dungeons is a first person dungeon crawler in the classic style of the 80s and 90s computer era, with a modern look and feel and real-time gameplay. Upon being separated from your fellow adventurer party, you are left alone navigating a deadly dungeon. Fighting your way through hordes of creatures in an attempt to escape. What begins as an attempt to escape to the surface turns into a fight for survival and a confrontation with an ancient evil, a descent to hell itself. As you progress deeper into the dungeons, you will find pages of journals with tidbits of story. An item seller also appears at certain depths within the dungeon where you can sell off your loot and buy items.
The game has four difficulty settings; Casual, Normal, Hardcore and Nightmare, the latter two being of the permadeath type of gameplay, which deletes your saved game upon death of the character. There is a map feature for help in navigating the dungeons.