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M4 · Pointer & UB Traps
2:30 on the clock
The clock is the server's. It starts when you press start, survives a reload, and answers after it are refused.
No hints, no autocomplete
One answer, locked in when you submit, the way it is when you say it out loud.
Debrief afterwards
When it ends you get the answer, the reasoning, and where the curriculum teaches it.