While I am no xbox or PS owner, I felt that I should post this so that others can get this.
In the past this game was available as pre-order bonus for Final Fantasy XV. This meant that if you didn’t pre-order the game you wouldn’t have gotten this game.
Now the developer, Square Enix has opened up the game for everyone, including those who don’t own Final Fantasy XV in the first place. Here’s a brief description from the PlayStation store:
Set in a fictitious 30 years before FINAL FANTASY XV, this game features retro-style inspired graphics centered around a fast-paced combat system with influences from modern gaming. The in-depth combat system blends intense attacks, devastating magic, mighty summons and unique companion attacks into a singular gaming experience through three diverse locations in the world of FINAL FANTASY XV.
Restless before bed, young Noctis asks his father, King Regis, to tell a fairy tale full of fantasy and adventure instead of just another generic bedtime story. Regis begins with a peaceful day being disrupted when monsters raid the royal capital, Insomnia. Young Regis, joined by Weskham, starts his adventure from the royal capital. Eventually they are joined by friends Cid and Clarus, where they travel to the plains of Duscae only to discover a mysterious cave where their enemy resides.
I don’t know how long this will be free for so if you want to get this I would suggest that you get it ASAP.