Looking for FPS like crossfire and combat arms

I need a FPS like crossarms and/or combat arms. It needs to be offline for most of the game. Please have it run on low graphics system (64mb).

Likes:

- Multiplayer Maps w/bots

- Story mode

- Co-op Play

Dislikes:

- High System Requirements

- Online for most of game

- Pay for bonus items

- No bots

EDIT: IT MUST BE FREE!

Try the original Call of Duty.

Counter Strike: Condition Zero is a game you might like

Counter Strike: Condition Zero is a game you might like

purple_MAN1832

Try the original Call of Duty.

thusaha

Both Crossfire and Combat Arms are attempts at CS/CS:S glory. Don't play the imitators - play the original game. Its online only, there are no bots or story, but that's what makes it the most popular online FPS ever.

But it's not free.

$20 for endless hours of entertainment and the most active online community... that's not asking much