Secret of Mana remake in Unity https://en.wikipedia.org/wiki/Secret_of_Mana

WASD / Arrows = Movement
Left mouse = Use Weapon
Space = switch character
I = Open or close inventory
C = Open characterpanel

God Keys:
Q = Deal Damage to all characters
E = Heal all characters

Find the 2 keys in the level.
Both keys will open doors.
In the newly opened rooms activate the lever.
Main door will be opened when both levers are activated.