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.
TorchED
Endless War Defense
jalada Air Strike Afghanistan
DOOM II
Contra Shotting NES
RESIDENT EVIL 7 biohazard
Duke Nukem 3D
Black Star: First Attack
Dungeon Siege: Yesterhaven
Gore
FizzBall
Sproink
Bugdom 2 Demo
Legendary Sonichaos
Star Prince
Kombat Kars 2002
Dream of the Blood Moon
Extrime Drive Live In Speed
Riseofthe Robots
Sky-Fighter
Quake 2
CrosuS
Primal Rage
Nexuiz
Battle Painters
Iron Grip: Warlord
Infinity Danger
Star Raid
Discover FDM
Add-on support
You can get add-ons that download files/video from arbitrary websites.