Work out what it does to a number.
Press START
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The table shows three numbers the machine has already eaten and what came out of it. ▶ PUT IT IN feeds it any number you like, as many times as you want — but the clock is running. When you think you know what it does, type what the gold number will give and press ✓ MY ANSWER. Get it wrong, or let the clock run out, and a bulb blows. Three blown bulbs and it is over.