And now, the next challenge, which some of you have...  already done? LF only SSTO! Make an SSTO which uses only LF, no oxidizer, and carries at least 4 passengers. You have one week, so get to it! Complete the challenge within a week to be awarded the unique mission patch! EDIT: This challenge was suggested by @AeroGav!   EDIT2: Medals, for easy access!
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