Feed Me Lies is a Mental Floor 5 Challenge introduced in Series 1, however it only appeared in Series 1.
The Caretaker's Explanation to the Game:
"This game is all about truths and lies. On this floor is a magical garden. In the center are two plants, Phyllis, who loves the truth and Madge, who loves lies. Unfortunates must choose a seed and put it under the magnifying glass. Phyllis will read out the statement written on it. Is it true or is it a lie? The unfortunates must decide which plant to feed. The unfortunates must feed three seeds to the correct plant to pass. Get it wrong three times and they fail."