Aethir's airdrop mission is expected to end at the end of May

https://airdrop.aethir.com/home?referralCode=1TMVu9B33dxBFmtMlz8s

galxe's mission is very simple and does not require gas, quiz answer BDCAC

Layer3's quiz answer BABABABCAD

NFT requires gas, and 0.3U is enough on the Arbitrum chain