In what’s probably the most original of Zynga’s ideas yet, the social gaming giant has officially launched Zynga Slots for iOS devices worldwide. Even better, the app is free to download, so there’s no pesky buy-in amount to stop Grandma from getting a taste of that Las Vegas-like rush.

Moreover, it’s improbable that you can lose the house and little Jimmy’s college fund on Zynga Slots‘ micro-transactions. At the most, you can only buy 25,000 Zynga-labeled “Z-coins” for $99.99 at a time, and even then, I’ll bet that most people would be prudent enough to stick to the much cheaper “400 coins for $4.99″ option for as long as possible.

But maybe I’m wrong. It is really easy to buy coins in this app.

According to the press release info Zynga Slots is available for both iPhone and in HD for iPad in 10 languages: English, French, Italian, German, Spanish, Portuguese, Traditional Chinese, Simplified Chinese, Japanese and Korean.