You can play all the games listed free of charge. There is however one caveat ...

Each game in the free version has only five variations in deals and then reverts back to the first one again. If you don't mind playing just five deal variations of each game then it's totally free. According to the forum on the developer's site, buying a licence allows for "millions of different deals for each game in the full version"

Forum is here: http://www.grassgames.com/cgi-bin/forum_new/ForumViewSection.cgi?forum=sol&section_num=0

So ... free? Sort of. If you don't want to play the same five variations of each game again and again then you have to pay, otherwise you'll just have to grin and bear it. Mind you, seeing as there are 64 games included, you get a total of 320 unique games before you get any repeats.

I'm no fan of the name. It is misleading (although a name of 'totally free' would be even more misleading) and the description should make it clear exactly what you're getting for free