Casinos that do not allow to test the games without registering

This is super annoying, I hate when casinos do that. When I'm on a new casino website I always want to try couple a of games for fun, without registering. But there are some sites which do not allow you to do that, furthermore they place a button on a game making you think that you can actually test out some pokies before registering, but once you make that click the registration window pops up with gazzilion of fields you have to feel (just to try out the game lol). I know that this is good for a convertion, as more people will be forced to register, but omg this can be annoying, I usually do not register when I see such pop up and just leave the website and never comeback there.