Terminology:

a game: a role-playing session, not a game in the sense of somebody trying to win
the game master: the organizer and/or writer of the game, in table-top games also the players' medium for interaction with the game world
to eläytyä: (verb) to immerse yourself into a character, to think, experience and feel through the character
eläytyminen: (noun) character immersion, see to eläytyä
GM: the Game Master
LARP: Live-Action Role-Playing game. A RPG where most action is acted out, not described.
to larp: to play in a LARP
RPG: Role-Playing Game.
Table-top: A RPG where most action is described, not acted out.
Turku: a city in South-Western Finland