We're not talking about charades here. Game night birthday parties can work for many different age groups, with younger kids playing age-appropriate games like tag or Candy Land and teens hedging their bets on the "blackjack table."
Small parties make it easy for everyone to play together in games such as Trivial Pursuit, Cranium or Scene It? (good for adults, teens and kids -- and it comes in themes such as Disney, James Bond and Harry Potter).
For a little more action, make it a Wii party, complete with bow-offs and tennis matches, or a full-on Rock Band concert.
For bigger crowds, set up gaming stations or put together a casino night with dealers, gamblers and poker chips.