Projects like this are often legally complex since video games are such a new medium, the copyright for them hasn't run out in most cases.
For example, they might take a piece of abandonware and continue its development, or dig up the source code for a canceled game, finish the title, and release it to the public. While the above two forms of preservation are the most common, fans find a lot of other ways to keep their favorite video games accessible too. Some even take an all-new direction, such as Final Fantasy VII Remake. While these are mostly faithful to the originals, they might fix dated or otherwise frustrating elements. These games are built from the ground up with new graphics, controls, and sounds. Sane Trilogy for the PS4 generation of consoles. For instance, the original Crash Bandicoot trilogy for the PlayStation was remade as the Crash Bandicoot N. Another example is full remakes of older games for modern systems.
