Oh yeah, level 98. That was a hard one. Basically I just threw the grenade from a distance, right after you beat the physics-block fallers. Just make sure you save there, cause then you can load it again and again once you run out of nades.
I'm on level 102 right now, how the HELL do you beat the weaponized lag? Right when you pass the 2x2 round challenge, there's no way to jump over the lagpad. How do you get over it? Is there a one-use f8 block i'm missing?