Currently, the only method of getting more Hard and Insane (yellow and red) mission keys is to purchase them with tokens.

Imo, there should be a way to earn keys for Hard and Insane missions.

Suggestion:

When you complete a Normal mission and open the "Boxes" for rewards, there should be a % chance to receive keys rather than SM Credits or XP (if you're not level 30).

Maybe a 4% chance of receiving a Hard mission key, and a 2% chance of receiving an Insane mission key?

It would also make it possible for F2P players to complete the Hard and Insane campaigns and open the box at the end with 2 Mythicals, if they're willing to sink a lot of time in campaign.

Wow, I thought Flux would have been more active on the forums but good idea non the less