Editing The Krypton Factor (section)

===Intelligence (1977–1993, 2009)===
A two or three-dimensional puzzle where shapes had to be put together to fill a rectangular grid or make a bigger shape was the basis for this round. Dr Gerry Wickham of the [[University of Manchester]]'s School of [[Mathematics]] devised most of these. As the contestants performed the task, presenter [[Gordon Burns]] provided commentary to viewers at home on the contestants' progress and advice on how to solve the puzzle. The contestants need to see beforehand what the completed puzzle should look like. In the first series, this round was first, and tests varied, often taking the form of what would later be Mental Agility tests.

Suppose a contestant is injured and unable to participate physically in this round (as happened to Diane Lindsay in the first episode of the 1978 series). In that case, an assistant may be brought in to complete the task under the contestant's instructions. Still, the assistant may refrain from speaking back or interfering with the task.

It is reputed that some of the intelligence tests featured took contestants hours to solve, with edited highlights of their performance in the round shown on the programme. At least one contestant was moved to tears by the difficulty of the puzzles. In 1990, [[Gordon Burns]] told contestants that over the years, some of the tests had taken 15 or 20 minutes to complete, but that in one programme in the 1980 series, when the competitors' tables had been placed too close together for this round, two competitors accidentally picked up pieces from each other's table, making it impossible to complete the puzzle. Nearly an hour had passed as they vainly attempted to finish before the problem was realised. This round was eliminated from the 1995 series.

In the early series, as well as the 2009 revival, a time limit was placed for completion, and after the time ran out, the contestants who still needed to finish were ranked according to the progress they had made on the puzzle. This round was removed (again) in the 2010 series.