Can I exchange nickels? And how much can one game cost in nickels?

They sell bags of nickels, bags of 50 ($2.50) or 100 ($5). One game can range from 1 nickel to 9 nickels, 3 or 4 is the average

The classic arcade games are 1 nickle. The most expensive I saw was 7 nickles... most were 3to4. They don't use tokens so you can use your own nickles or exchange bills for bags. They will exchange any amt you want but pre sorted bags are quicker for them.