Round 1: All your base 64 are belong to us.
Round 2: Encode-ception.
Round 3: Snowden’s-eloquent-quotes.jpg
Round 4: @ is a common symbol used with device names.
Round 5: Satellite connect-the-dots.
Round 6: The image from round 3 is more than meets the Eye. (There is a hint in round 1.)