10. Torchlight II (Runic Games, 2012)
There are quite a few Diablo-styled action roguelikes on the PC, but the one that takes the genre to perfection in my book is Torchlight II. Created by a team partly made up of former Blizzard North (Diablo I) staff, Torchlight 2 takes everything that made Diablo a hit and cranks it up to eleven. Combat is fast and frantic, the four playable classes in the game can be customized in any way the player wishes, and online multiplayer (sorely missing from the first game) is now back in full force. The game even has full support for player mods which can even be used in online games, though all players must have the same set of mods installed in order to play together. Some other clever tweaks, like each player finding separate loot drops and being able to send your pet back to town with a haul of items to trade in for cash or potions, also make sure that the action remains constant throughout. Torchlight II is pure fun.
9. Half Life 2 (Valve Software, 2004)
8. Duke Nukem 3D (3D Realms, 1996)
7. Ultima IV: Quest of the Avatar (Origin Systems, 1985)
6. Scorched Earth (Wendell Hicken, 1991)
5. Planescape: Torment (Black Isle Studios, 1999)
4. Thief 2: The Metal Age (Looking Glass Studios, 2000)
3. Simcity 2000 (Maxis, 1994)
There also exists a rare, network-enabled online edition of the game that allowed up to four players to act as 'city commissioners', operating on the same map and exchanging resources with one another to work toward their own goals.
2. System Shock 2 (Looking Glass Studios/Irrational Games, 1999)
1. Ultima VII: The Black Gate (Origin Systems, 1992)