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.
Metal Slug
Battletech
Street Racing Stars
Plazma Burst
Mad Skills Motocross
Naval Attack
Galaxy Strike
Heavy Weapon - Atomic Tank
Fatal Puzzle
War Machine
Batman
Falco Xonix
State of War - Warmonger.exe
Strike Ball 3
Sage Fusion
Balloon Park
Castle Ghosts
Half-Life : INVASION
Contra Hard Corps
NecroVisioN
Sonic and Knuckles
Zafehouse: Diaries
Half-Life Decay PC
Universe Gamers Gunz
Sonic the Hedgehog
Water Bugs
Conflict Desert Storm
Discover FDM
Add-on support
You can get add-ons that download files/video from arbitrary websites.