You will periodically be forced to shrink your party (using the Mini spell). During these times, switch everyone to Magic users (Mages or Red Mages) because physical attacks do zero damage while shrunk.
Here is a helpful write-up on how to survive and thrive in a Tight Fantasy environment. tight fantasy 3
Battles take place on isometric grids with height advantages and trap mechanics. New to TF3 is the Pressure System : characters gain stacking debuffs when surrounded, encouraging careful positioning. You will periodically be forced to shrink your
Book one, The Lock , took place entirely within a besieged citadel. Book two, The Key , expanded the map to the surrounding sewers and siege works. But it was Tight Fantasy 3 that utilized the constraints most effectively. Battles take place on isometric grids with height
Magnetic Slam (Pulls all enemies within two tiles into a cluster, dealing collision damage to all of them).
Since "Tight Fantasy 3" is not a widely recognized standard academic or literary topic, it most likely refers to a specific project, an internal business report, or a creative writing prompt focusing on a "tight" (highly disciplined or low-magic) fantasy world-building concept.