With what should I replace Adobe Flash Player?

I'm Mac user and Preview isn't working I've been using Adobe for many documents.

Since Adobe is dsicontinuing certain products (?). What do I use as replacments? 

Yeah, the point here is that it's time to replace the thing that depends on Flash Player.  A google search for "alternatives to <x>" is usually a good place to start.  Just be a little choosy about picking solutions from reputable companies.  If you're on MacOS or Windows 10, the relevant App Store for your operating system offers at least some degree of vetting and curation vs the free-for-all on the open web.

As far as casual games go, finding something comparable to a game you like that's paid means that you lose the ads and all the speed-bumps that are designed to maximize advertising revenue.  It might cost you $20-30 to pay for a game, but it's usually worth the trade in terms of enjoyment.

There's a game service called Humble Bundle (humblebundle.com) that offers monthly "pay-what-you-want" bundles that raise money for various charities.  They usually start at $3-5 dollars.  The post-holiday selection is a little thin at the moment for things that would probably interest you, but they also have individual games in the store, and a portion goes to chairty.  Just search for a category that you like (e.g. "farm", "puzzle", etc.) and you'll get a bunch of options. 

I don't usually recommend products and services here, but that might be a win-win-win in terms of getting quality games that work with your budget, while also doing some good in the world.  It might be worth a look.

MacbookPro