Ultimate Ninja Samurai Hachibitsu - Infinite Runner that will have you tearing your hair out!

I'll warn you now, this game is frustratingly difficult, so much so that I only lasted 10mins before I wanted to slap the computer. Ultimate Ninja Samurai Hachibitsu is an Infinite Run and Jump game where your task is to run across the tops of roofs, shooting other ninjas while trying not to fall to your death. Developed by Druid_CZ this game will have you screaming in frustration but wanting to come back for more, and it's free!
Systems : Any, Flash based

A Precious Arrow - Free browser based Arcade game

Game Type : Arcade, Platformer
Developer : Benjamin
Game Info : Welcome to A Precious Arrow, a game with retro style graphics! Your character must find the bow and arrow and traverse to the end of the level to win. You may ask, why is it precious? Well you can only use it once, and then that's it. So while your jumping and crawling your way past enemies, think carefully before you use it.
Release : Now, Free
Systems : Any, Browser based

Space Rotary - In a quest through the universe (Free Platformer)

Game Type : Platformer
Developer : Modelsheep studio
Game Info Quote : In a quest through the universe, the brave Oigres launches into interplanetary adventure. He´ll have to face dangers and traps to reach his spaceship. Help this young explorer to continue his journey! Dodge lasers and keep in mind the gravity to move on and prevent your ship for beeing destroyed. Discover the different worlds and return safely to the space!
Release : Now (Free)
Systems : Any, Browser Based

Flight of the Data-Thief - A free Star Fox Style Rail-Shooter

If Rail-Shooters are your thing or fancy something different, then this a fine game worthy of your time. Thanks to the developer Tales of The Renegade Sector Games, they've produced a fun free flashed based title in the unity engine, called Flight of the Data-Thief.  In this game you control a space ship through endless corridors, while avoiding obstacles and shooting enemy ships that pass you by. The story goes that you play as a Data-Thief: a skilled pilot who can fly into a corporate facility, grab their data, and then fly out again.  Getting the data was easy but getting out isn't, as the whole planet is on high alert and out to stop you.