Easy: Lecture contains an algorithm for diagonalising 3×3 matrices and an example. Tutorial/exam has students do a very similar example (e.g. both matrices have lots of zeroes in the same cells).
Harder: Lecture contains an algorithm for diagonalising 3×3 matrices and an example. Tutorial/exam has students do a matrix that is structurally very different.
Hard: Lecture contains an algorithm for diagonalising 3×3 matrices and an example. Tutorial/exam has students extend the ideas of the algorithm to a specific 4x4 matrix.
My own undergraduate experience was largely in the "hard" category, whilst as a lecturer at a different university there was pressure to move increasingly towards the "easy". It was even fairly explicit: student feedback surveys would be aggregated and you'd be informed that the students are unhappy because the tutorial exercises cover things they "haven't seen" in lectures.