TraceZ — Same code, two players: first to the right output wins.

How to play TraceZ

1. 1A short pseudocode program appears for everyone.
2. 2Work out what it outputs — a trace table helps.
3. 3Type the output; the first correct answer takes the round, later correct answers score less.
4. 4Best of the rounds wins.

What it trains

Dry-running and trace tables (2210 §8, 9618 §11) — a guaranteed exam question.