Some principles for creating an expansion, from Scott Caputo (designer of Kachina/Völuspá):

  1. It has to be desirable.
  2. It has to feel like part of the original game.
  3. It cannot make the game feel overly long.
  4. The new [components] have to work well together.
  5. It needs to allow for more planning.

http://boardgamegeek.com/blogpost/12929/designer-diary-voluspa-or-how-a-native-american-su

SEE ALSO:

Lessons learned designing an expansion, by Grant Rodiek (@HerrohGrant):

http://cardboardedison.tumblr.com/post/19177839103/lessons-learned-designing-an-expansion-by

Cardboard Edison’s Favorite Tips & Resources – July 2012

Board game industry players answer the question: What makes a great game?

http://goforthandgame.com/2012/08/12/what-makes-a-great-game/

http://goforthandgame.com/2012/08/22/what-makes-a-great-game-part-2/

There were 47 different answers to the question “What makes a game great?”. The element that showed up most was hard decisions/meaningful choices. Nineteen percent of my guests felt that this was essential for a game to be considered great. The next most mentioned aspect of a great game was a three-way tie between 1) many paths to victory 2) a sense of story 3) depth that can be explored all coming in with 8% of my guests mentioning these aspects.