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.
Bad Sector
Fur Fighters
GoldenEye Doom2
Castlevania Bloodlines
Necroxia Nova
Bloodmasters
Mideast Crisis 2
Batman Returns
T2002
Waterworld
Ratinator
Jungle Strike
Europa Barbarorum
Dynamite Duke
Shoot Them All
NovaMetin2
Virus
Exterios
Apache
Vertrix
NVIDIA Alien vs. Triangles
Duck Shooter
Alien Attack
Mutant Factions
Wreckage
Super Mario Flayer
Rivals Evolution
Breaking Point
Discover FDM
Add-on support
You can get add-ons that download files/video from arbitrary websites.