Dragon Cave is a free adoptables site. The premise of Dragon Cave is that you are a dragon trainer with a seemingly unlimited lifespan who collects dragon eggs and raises them to become adults.
Like many adoptables sites, the dragons are represented by graphics and are not actual living organisms, or even simulations. These graphics consist of sprites: small pixelated images that "grow" on your scroll (the scroll being a list attributed to your personal account, consisting of your dragons and their statistics). Based on time, clicks, and views, the dragon will hatch and grow into an adult. If certain requirements are not met (x amount of clicks/views) within a set time period, the egg or hatchling will die.
There are many different breeds, or types, of dragons and collectors are free to collect based on their own preferences. This can include single-breed scrolls, scrolls consisting only of rares or of their favorite breed(s), frozen hatchling "armies" (hordes of hatchlings that will never reach adulthood), or simply users trying to collect all breeds. Several dragons are secret or discontinued (see Dragon Types for more information), making the game much more interesting for users looking for complete sets.
Players have the ability to breed two dragons to create an offspring having a 50/50 chance of being the same breed as one of their parents. Some dragons may also produce hybrid dragons, such as the Soulpeace Dragon. Some dragons cannot breed even if they have genders, and these are classified as Unbreedables, such as Undead Dragons.
Players must also catch their own dragons by clicking on available dragon eggs, either from the main cave (index page) or the Abandoned page. Eggs obtained from the front page (or "cave") are caveborn; these have no lineage, having come into existence mysteriously. The abandoned page (also known as the AP) contains eggs that others have given up in some way. These may or may not have lineage, but it is far more likely to find dragons with parents or even large family lines in the AP.
Since June 10, 2011, Magi Dragons have the Breed Specific Action Teleport, allowing for two-way trading or one-way transfering of up to four eggs/unfrozen hatchlings, effectively replacing Abandoned Page trading. Teleport has a two-day cooldown.
From the account settings page, users have the ability to change from the default Dragon Cave theme to something else they prefer from the following examples below.