You play the whole game from "Crew Expendable" to "Mile High Club" with no cutscene missions and see how far you get, lives carry over between missions. You can pause the game but if you lose all your lives then you have to start over.
5 Points are awarded for hitting an enemy without aiming
10 Points are awarded for hitting with aiming
50 Points are awarded for killing an enemy by shooting his legs
60 Points are awarded for killing an enemy by shooting his belly or arms
70 Points are awarded for killing an enemy by shooting his neck
100 points are awarded for a headshot
150 points awarded for destroying a tank
150 points awarded for making a barrel explode
1000 points awarded for shooting down a helicopter
2000 points awarded for shooting Zakhaev in One Shot mission
2000 points awarded for destroying a ZPU in The Bog mission
Multiplier awarded if you continually kill enemies (up to 8x)
One life awarded for completing a kill streak
One (or more) lives awarded if you reach a checkpoint
If you lose, the final score is just your score times the difficulty (1 for recruit, 4 for veteran).
If you win then your final score is your score, plus the time you took in seconds times 5, plus 1000 for each life, times two if you did not die and finally times the difficulty(1 to 4).
![{\displaystyle FinalScore=[BaseScore+(Time*5)+(Lives*1000)]*2(Flawless)*Difficulty}](https://en.wikipedia.org/api/rest_v1/media/math/render/svg/c40590b13ba84126b5ff58bcd9e20cb55a7c8c9a)