Do the games at the fun house cost money? If so how much per game?

Yes they cost money. Pricing depends on the game. Putt-Putt is $1 for 9 holes, Quick N Crash shooting game is $.25, most table games are $.25, and I believe Whack-A-Mole is $.25 as well. I can't remember the Skeeball price but it's likely $.25-.50.

Pretty cheap. 50 cents. Maximum a dollar