Cash

Cash is the main currency in 3-2-1 Blast Off Simulator used to buy the majority of items in the game. These are as follows:

Fuel Scoops

Backpacks

Rockets

Rank-Ups

Most of what can be said about cash is mentioned in the currency page, but here is the gist on the two ways it is obtained:

1 - Launch a rocket to some altitude. The cash received will be the final altitude times other bonuses.

2 - Buy cash using robux in the Cash & Gems shop.