Black knight
Easy
Shoot drop targets. You only get points if all 3 go down on the same bank, but you get extra for doing the same bank multiple times.
Medium
Go for multiball. Soft plunge the ball and hold right flipper so the ball lightly bounces to left upper flipper, then lock. Do this 3 times for multiball. If the ball enters lower playfield, hit scoop in center to start multiball. Multiball is a multiplier, so 3 balls in play grants 3x that drop, which can be worth a lot with repeated hits. After building 10-15K bonus, shoot the left figure 8 to increase bonus to 2x/3x/5x. The figure 8 can be risky, so safer to do in multiball, but can be worth it to drain if there is a large bonus built. Shot is easiest on a backhand if the flippers are strong enough, if they are weaker you have to use the right flipper though.
Hard
General notes
Note - if “hard mode” is on - you have to go through the 2x figure 8 to lock a ball. You should make sure magna save is ready before doing it