Abandoned Linux classic games
Linux has never been a particularly well-known and popular operating system for video games. Despite this, over the decades, several independent developers have worked hard to design and develop games natively supported on Linux.
In keeping with the ideals of those who supports Linux, several developers created completely free and open source games, several of which have disappeared from circulation, forgotten by a merciless Internet. Others have survived oblivion, abandoned, but still available to the public who knows how to find them.
There are several approaches to gaming on Linux for games not natively supported. Wine is ideal for native Windows games. Alternatively, you can always use a Virtual Machine. DOSBox is a valid DOS emulator, even on Linux (take a look at DBoxFE, a front-end for DOSBox).