There are numerous ways to earn coins in Hidden Chronicles.
Firstly, and most obviously, you get coins from completing scenes, with more money being paid out for each depending on the score you get.
There are also various quests to complete, often giving you XP, coins and items (which you can then sell) in return for your success.
Keep an eye on the game's social feeds, as this provides you with quick access to items and gold. Another social aspect is visiting your neighbors. Every time you go, you'll be given coins and energy in return. Some of your neighbors might leave you gifts too, earning your 50 coins - similarly, you earn 50 coins for leaving packages in return.
The easiest (but least sensible) way to get coins is to buy them using real money. Sometimes you can get them cheaper than usual, but it's still not the best idea unless you're loaded!
Added by: MongooseGeneral Feb 14th 2012, ID#218