Three blurbs
Label: match each card to a skill you can name. Use the supplied skills to choose a starting task.

B1. Saved lines with UTC timestamps. The job is to cite the line that records a lamp turning on.
Skill already taught: logs-as-evidence.
State: ready.

B2. A local text file. The job is to read the first line and leave the file unchanged.
Skill already taught: reading a file.
State: ready.

B3. A compiled program. The job is to follow a compare and a jump in assembly.
Skill named on the card: assembly.
State: later. Reversing teaches that skill after this stage. It is not required to finish First CTF.

Activity result: defer B3. A ready card is B1 or B2.