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World of Final Fantasy is a turn-based RPG developed by Square-Enix for the Playstation 4 and Vita systems. The game is full of references, direct and indirect, to past Final Fantasy games, including characters, locations, creatures, etc. The game also has a lot of self-referential and tongue-in-cheek humor:
The Plot
Twin siblings Reynn and Lann wake up one day to find that everyone is gone from the town they live in, Nine Wood Hills. A mysterious stranger shows up and tells them they are Mirage Keepers--people who can capture creatures and command them in battle--and that they are originally from a land called Grymoire, but they have lost all their memories of it. With a newly opened portal, Reynn and Lann set out to learn about their past and who they are.
The Characters
Reynn is the more cautious of the two siblings. She frequently plays the straight man to her brother's antics and prefers to spend some time thinking things through before acting. She fights with a glowing dagger that can change colors based on elemental attacks.
Lann is a bit of a blockhead sometimes, but he always means well. He is a poor listener and usually has to clarify things that were just told to him, but he comes through when it counts. He fights with his fists.
Tama is a Mirage that travels with Lann and Reynn, helping them out on their journey. Tama has many significant powers, such as the ability to reverse small amounts of time to whisk Reynn and Lann back to Nine Wood Hills before they die, preventing a Game Over. Tama also has a weird speech pattern in which she will add "the" in front of random words. Needless to say, it can be a bit the-jarring.
Mirages
Mirages are the primary enemies and teammates in World of Final Fantasy. Most of them can be caught ("imprismed") by you in battle after fulfilling certain conditions, such as lowering health, using fire attacks, or inflicting status ailments. When a mirage's defenses are down, you can try to imprism them as long as they are imprismable and you have a prism of the correct type (you will automatically receive one when you encounter a new kind of mirage for the first time). If the imprisming fails, you don't lose the prism, so you can just try again right away. After they're imprismed, you can use them in battle for yourself, with certain restrictions, which brings us to...
Battles
World of Final Fantasy has an ATB/Turn-based battle system. Characters wait for their icon to rise to the top of the ATB bar before they can take action. The higher agility characters have, the faster their icon rises. Most actions require AP to perform. AP replenishes every turn, but only a little, so if you use a bunch of AP-heavy attacks, you'll have to wait a few turns before using them again. You might notice that characters are standing on top of each other. That's because you can battle in what are called stacks. Each mirage/character has a size, either Small (S), Medium (M), Large (L), or Extra Large (XL). When you set up your stacks, they must be in size order, with smaller sizes on top of larger ones, so you could have a L-M-S or a M-S stack, but not a S-L stack. XL mirages can't be put in stacks, but they can be summoned in battle to help at the cost of all AP.
Reynn and Lann can also switch between Jiant and Lilikin forms, which changes their size in stacks. Jiant forms are Large, and Lilikin forms are Medium.
When your characters are stacked, the stack gets the combined stats/abilities/AP of each character, but the stack only gets one turn. You can opt to unstack, so each character gets a turn, but you'll also be weaker. There are few situations where unstacking is a good strategy. However, a stack can topple over, and each stack gets a stability rating, based on the weights/types of mirages you stack. If the stability is weak, then the stack will be easier to topple, which temporarily stuns all the characters in it and forces them into unstacked mode. You can restack them as soon as they recover.
When you stack certain kinds of mirages together, you can get upgraded abilities/attacks. For example, stacking together two mirages that know Cure will allow you to use Cura. Stacking two physical attackers together might let you use a combo ability like Cross Slash. Experimenting with different mirages can get you all kinds of combo abilities.
Enemies can also come stacked, and they are just as vulnerable to getting toppled, which can be a good strategy to pursue.
Non-player characters called Champions can also be summoned in battle to perform an action, provided you have obtained their medals and have enough of the Champion Gauge full. These actions can be full heals or strong attacks that ignore defense while simultaneously boosting your characters' strength. Your Champion Gauge fills while you participate in battles.
When you lose a regular battle, Tama will reverse time to just before the battle and take you back to Nine Wood Hills, so if you were in a dungeon, you'll have to start over from the beginning. When you fight extra powerful mirages (bosses), Tama's ability won't work and you'll get a Game Over if everyone is defeated, meaning you'll have to reload your last save.
Mirage Boards
Mirage Boards are how you develop your mirages, including boosting their stats, learning new abilities, and transfiguring them into different forms. As they gain levels, your mirages earn Skill Points (SP), which they can spend to unlock spaces on the board. This is also how you can obtain more prisms of their type after you get your initial free one. When you meet the requirements (levels or having certain items, generally), you can transfigure your mirages into new ones (usually changing their size, so you have to think about that when you do). If you're changing it to another one in the same family, like a Chocochick to a Chocobo, you keep all the spaces you've already unlocked, but you get access to a new Mirage Board with different spaces. If you change entirely, like a Chocochick to a Black Chocochick, you get a new clean board, but you get all the SP you've accumulated back, so you can fill the new one out.
As you fill more of a mirage's board out, the Sync Level will increase. At certain points, when it increases enough, your mirage will get a boost to all stats.
Videos
E3 2016 Trailer
Opening cutscene