Sonic Blast

Sonic Blast is a Perk-a-Cola which costs 3000 points.

Ability
The effect of the Insta Cola is to increase the killing's damge till wave 30 and 4 hits on wave 35, 3 on 40 and so on. It also makes the knife's speed much which can be usefull if the player has the bowie knife, different knives also and so does the Galvaknuckles.

If the player has the knives it will make the effect of the perk even stronger by making it kill like easy than just a power up.