Demo games are games that can be downloaded and played only within a limited number of hours. Demo games are meant to encourage people to eventually buy the game. Demo games are designed to whet the desire for these games.
Types of demo games
Typical demo games for casual gamers come as free downloads or free playing of the web version. Demo games with free downloads lets the user play with the full-feature of the demo games. The downside here is after you've really gotten into the demo games, your trial ends in just an hour or two. Often these demo games are addicting and can encourage the user to buy the paid version. Another version of downloaded demo games are those that have unlimited trial but come with corporate sponsorship. With these demo games, you need to withstand about 30y seconds of advertisements every ten minutes. Interrupted demo games are the cost for not paying for the full-version.
As for web version demo games, developers have made it less feature packed. You don't get to do as much with web version demo games compared to the actual paid download games. The upside here is that the "trial" of these web version demo games is unlimited.
Typical demo games for role playing games such as World of Warcraft let you download the full version of the game but with certain features or levels locked. You can liken these demo games to free software downloads that won't really let you use the whole thing. Demo games of this time have timed trials, which typically runs between a week to ten days. After which, if you liked the demo games, you will need to pay to get the license key to unlock the rest of the features.
Unlocking demo games
There are devious ways to unlock the demo games of casual gaming or those big software games, as in role playing games. Online, you can find sites that give you crack codes to demo games - this, after several pop-ups or, if you are unlucky, forced downloads. Do not resort to these sites. You will most probably just get several viruses and spyware into your system when you do. In the end, if you like the game so much, it is better off to pay for the whole version This gives you a legitimate version of the game. Likewise, you do not endanger your computer system.