Action games
If you don't play games that much, there is a big chance you have played an action game, e.g. a shooter, at some point. This category is full of games that won't let you get bored.
Little Fighter
World of Kaneva
Hitman 2: Silent Assassin
Super Smash Flash EXE
The Elder Scrolls: Arena
Destiny 2
Transformers - Revenge of the Fallen
jalada AstroChase
Shift Happens
Townopolis
Krrish - The Game
Half-Life
Air Assault
Runica
Prince Of Persia - Warrior Within
Tilelander
Power Hour
Far Cry
Super Smash Flash 2
Yargis
Alien Terminator
Left 4 Dead
GTA Green Lantern
Gang beasts
Resident evil 5
Crysis WARHEAD
Spore: Galactic Adventures
Jurassic Park Operation Genesis
Battle For Graxia
Left 4 Dead 2
Discover FDM
Add-on support
You can get add-ons that download files/video from arbitrary websites.