fácil | 
54%
Destroy level-1 boss
medio | 38%
Destroy level-2 boss
medio | 35%
Destroy level-3 miniboss
medio | 30%
Destroy level-3 boss
medio | 26%
Destroy level-4 miniboss
medio | 22%
Destroy level-4 boss
difícil | 19%
Destroy level-5 miniboss
difícil | 17%
Destroy level-5 boss
difícil | 15%
Destroy level-6 boss
difícil | 11%
Destroy level-7 boss
difícil | 11%
Destroy level-7 final boss
muy difícil 
| 9%
Complete the game on 'Easy' difficulty
muy difícil | 6%
Complete the game on 'Normal' difficulty
extremo | 3%
Complete the game on 'Hard' difficulty
extremo | 2%
Complete the game on any difficulty setting in coop mode
extremo | 1%
Complete the game on any difficulty setting with no deaths
Complete the game on 'Hard' difficulty with no deaths
extremo | 2%
Complete the game on any difficulty setting 2 times in a row
extremo | 2%
Complete the game on any difficulty setting using only default weapon
medio | 28%
Die 100 times
extremo | 1%
Find all hidden power-ups
difícil | 13%
Steal a life from other player in coop mode
difícil | 18%
Use maximum charged fire for all weapons
fácil | 52%
Earn an extra life
extremo | 1%
Collect all power-ups in the game including all hidden power-ups
extremo | 1%
Earn 500000 score
difícil | 10%
Start the game as human
extremo | 3%
Don't kill the crawlers on level-2
extremo | 3%
Gather 10 walkers on the screen on level-6
extremo | 3%
Don't kill the tongue climbers at the elevator on level-7
extremo | 2%
Get squashed by the roof during the final boss encounter
extremo | 4%
Kill 10 enemies with one shot
extremo | 1%
Listen all tracks in music test menu (complete the game on 'Normal' difficulty to unlock it)
.
Mensual
Total
