Adventure, also known as Colossal Cave Adventure, is the namesake of the adventure genre. Although it wasn't the first such game, it was the first one that was popular and influential. Adventure is entirely textual and has a simple two-word parser to interpret commands. The goal is to find all the treasures in a vast cave, which is in large part based on a real cave system.
Valid movement options are usually included in the description of a location, but there are also some secret paths, and no useful information is provided for the two mazes, one of which is unnecessary to complete the game. Since locations often don't connect in a linear fashion, mapping is essential. The game also contains fantasy elements. Although rare, it's possible to be killed by randomly appearing dwarves. Otherwise, death almost never occurs except when falling into a pit, which naturally happens in the dark. Consequently, the adventure is over if the lamp goes out.
Various puzzles have to be solved to acquire all twelve treasures, often requiring other items found in the game. Since inventory space is limited, not everything can be collected in one go. Once all of the treasures have been dropped in the building, the final puzzle sequence is unlocked, though it takes a while until it begins. Points are awarded for significant actions, but something unrelated to the completion of the game must be done to get the full score and achieve the highest rating.