I would recommend Monster hunter 3 ultimate and Bravely default.
Just a heads up, the demo for both these games are kinda bad.
The MH3U demo have a "easy" and "hard" target. But new players who never played monster hunter will fail on easy since the monster isn't exactle the easiest and they only give you 15 minutes to deal with it. You would probably waste most of your time trying to figure out the controls, camera, getting up and getting hit.
The bravely default demo throws you at the game at level 1 with a couple of jobs and an NPC will even say "the cave to the west have weak monsters that anyone can deal with it", naturally you would go there to check it out and before you can even understand what brave and default are an army of goblins wipe your party. In this demo you are supposed to do the quest first and not explore, fighting enemies in the area of the quest, going back to town, resting and repeating the process again. Not only that but they also expect you to build norende and buy the items from there as you go but you will probably advance in th game faster than you can get upgrades and buildings from there. Despiste everything if you can go past the hard and complicated start you can get 6 hours or so of fun from the demo alone.