The phrase in question pertains to electronically accessible entertainment focused on the activity of creating subterranean cavities. The defining characteristic is its availability at no cost to the end-user. As an illustration, consider applications where the primary gameplay loop revolves around excavating through various virtual strata, potentially uncovering resources or encountering challenges.
The appeal of such digital pastimes lies in their accessibility and often simplistic core mechanics. This allows a wide audience to engage without significant financial investment. The availability of these titles has broadened the scope of gaming, introducing individuals to interactive entertainment who might otherwise be excluded due to cost barriers. Historically, the development of such readily available entertainment has paralleled advancements in software distribution and the rise of independent game developers.