It is definitely a game for many people (like 6 takes). At second I do not want to play it as well as we played in threes again did not really enthusiastic over. Six people but it is very entertaining - even if you're just resigned because someone has just forced my princess to drop. The rounds never last really long.
We usually play up to 3 hearts.
There is an "official" instructions to the game with more than one person: Google for "Big Love Letter". All you need is two sets Loveletter and then has to combine the cards accordingly.