A short guide to Febbit:
Credits are used to improve your chips.
The Dusts are used to update the modules above Mk5.
The Febbit is used to make purchases in the shop.
Every hour you can get your satoshis, think about it! In addition you will also accumulate experience, allowing you to be more efficient.
The more experience you have, the more missions you can complete (icon at the top right, next to the gift).
Small tip to scratch even more experience, when Cool and Energy blocks are in green, click on it! This will brings you more experience points!
Feel free to comment if you have questions, and if you are not registered yet go here.