Ninja games are highly regarded as beautiful, difficult, challenging, and fun games to play.
Whether it's a free game like "N Ninja", which is entirely written in Flash and can be played online or offline, or it's a paid game on consoles like the XBox 360 and PS3, like Ninja Gaiden, they can be enjoyed by all people, young, and old, regardless of gender.
Many nowadays, however, are looking for free games they can play directly on their Internet browser, and this can be a bit difficult to setup.
There are a few steps needed before playing Ninja Games online for free:

1. Ensure that you are allowed to play such games and you are not behind a firewall that disallows online gaming, and please do not play games at work.
   You're getting paid to do your job, not play games.
   I am not responsible for any lost work time or loss of a job.
   
2. Most online games will be coded in Flash or Shockwave, which are simple Internet plugins that can be downloaded here and here, respectively.
   These two plugins are legitimate and do not contain any sort of adware, spyware, malware, or viruses.
   Support for these two plugins can be found on the Adobe website.
   
3. Typically, you will have to restart your browser after installing these plugins for the changes to take effect.
   
4. Finally, find a site to play on! There are thousands out there with various games ranging from shooting games to puzzle games.
   It's just a matter of finding a link, Googling for your favorite type of game, or asking a friend! You may see a link right below this step that will take you to the best Flash and Shockwave games on the Web!

Have fun!