Starting from the third area/zone, some missions are gonna need specific cards before you can initiate them - much like the Starbits Millionaire mission which needs a specific card issued by the devs (as well as the 1M SB on the Engine).

You've already seen how i6 Mid Range Acoustic is needed to open the second area (and you'll have to hold onto it for the entire time).

Unlocking Area 3

Touring Coach

The third area is more-or-less the same. You'll need a "Touring Coach" which is technically that bus with 550 Fans to unlock it. You can either try your luck and get it through opening packs, or you can snatch it off the market right away.

4 Band Members

This one is the most annoying one. It's pretty much straightforward, there's a mission in the second area called "Band Audition". You'd have to do it to unlock 4 Band members and equip them for the third area to be unlocked. The missions take 4 hours each and have a 20% chance of unlocking a Band Slot.

I was lucky enough to unlock all four in ~15 tries, but they can be a bitch to some, so prepare yourself.

NFTs for the Missions

Can of Petrol

Some missions throughout the third area require Petrol Cans and the most required is 25. You can get that much with no worries just to be sure. The game sells them at a 5K SB/2 SWAP.HIVE fixed price - they are not found in packs, unlike the Coach.

First Rehearsal Room

Not to be confused with CHEAP Rehearsal Room (which is actually more expensive lol). This one is needed for the 5-min mission (first mission unlocked at level 80) in the third area. This one is also on the market at 10K SB/4 SWAP.HIVE - these ones are not found in packs either.

TL;DR

The Checklist:

• Touring Coach - Unlocking Area
• Band Members - Unlocking Area
• First Rehearsal Room - For the 5-mim Mission
• 25x Can of Petrol - For Missions