This is the second game from the serie, released in 2015. It is not Abandoned 2; it's spin-off, the part outside the main story line, like a bridge between the first and the second parts.
If you played Abandoned 1, you should remember the location with colour cube chambers inside the pyramide. That location stimulated a big discussion between players. In Abandoned: The cube chambers you woke up inside the huge complex that consists of a lot of cube chambers. You remember nothing: who you are, what do you do there. You only realize one thing: you must escape from that place.