Do you know how annoying it is how lasers can go uphill anywhere, while you are restricted to stairs and pre-programmed slopes? STAIRS? Stairs and programmed slopes are for sissies, real badasses use Grenade Jetpacks! But since eating boatloads of hamburgers over the centuries has made us increasingly heavy, you need to consume 1 grenade per second to keep you afloat! PER SECOND?! Yes, my fat friend, you need to lose weight to stop using so many grenades! Creepers are in limited amounts these days, so we need to reduce our usage. That may come in an update of the future, but for now, that grenade powered jetpack can send you over an obstacle! Perilous peaks are now no longer a challenge! Your jetpackless friends will be so jelly!

Brought to you by T&B Inc. Transport Sector. See ya starside. w00t 600th post!  

I like the idea, but instead of 1grenade/sec, maybe 1grenade/jump, like the way the mission baddies use their jet packs to jump through trees? (Wait, jumping through trees?) Anyway, they jump through trees and over obstacles.  

Yes! Better idea! and maybe an upgraded version can cause splash damage around you at the cost of hurting you.