Clear it in 3 steps
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Start the environment
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Investigate the target
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Submit the flag
data.txt holds many sha256 hashes. The flag was split into ordered chunks; each chunk is hashed as sha256("{i}:{chunk}"), and the chunks appear in the shipped wordlist.txt. Brute-force each chunk and concatenate them in order to recover the flag.
Each line is a sha256 hex; real lines are sha256("{i}:{chunk}") and the chunks are in wordlist.txt
For every word w and index i (0..~30) compute sha256(f"{i}:{w}") and match against data.txt
Sort matched (i, w) by i and concatenate the w values to get the flag