Does anyone know how to get free field for the Desert?

[Laguna]

I'm really curious, I've spent all day trying to get it. I've already done 2 of the 3 tasks... 1 left, but not sure what it is...

[Chaosfissure]

Beat free field caves with S-Rank in 20 minutes or less.

EDIT: Oops, I cant' read. I thought that was for unlocking desert, not free-field XD

[BIG OLAF]

Beat free field caves with S-Rank in 20 minutes or less.

No, that doesn't give the Free Field for Desert. It just starts the Desert mission chain.

[Chaosfissure]

Doh, sorry about that, it's late at night and I can't read XD No clue then.

[Lumir]

Beat last desert mission in under 18mins. And GL because I have tried over 5 times, the map is so random, and bosses spawn all the time. There are 3 maps and the last one you have to drill 2x. But on that map a boss can randomly spawn multiple times slowing or stopping you from mining.

[Laguna]

I've literally spent 5+ hours trying to get the desert free field. I'm sorry, but I've tried a lot of things. I dunno why it hasn't hit me yet.

[supersonix9]

I just said "Screw it I have Hard Mode、 which is better anyways."

[Arika]

Desert free:
1. Beat the 2nd desert mission with S rank speed run.
2. Beat the 3rd desert mission with S rank speed run.
3. collect 2 data item from any machine monsters.

Hard forest:
1. kill 5 rockbear
2. kill 5x worm dragon (the small boss thing. not the real dragon)
3. kill 5x antling.