Hashi -1 : Use the "No islands" rule throughout the grid - inspired by a comment from Prasanna that very few Hashi puzzles use this rule extensively
Hashi -2 : Masyu like chain which goes from top left to bottom right
Hashi -3 : Interaction of two 5's near the center
Hashi -4 : Interaction of the 4 and the 5's at the center. This one was my personal favorite for the entire set

Magnets 1 : Easy puzzle used to replace a harder magnets puzzle
Magnets 2 : Existence of half the grid size (8/2 =4) in one of the polarities forces a few bars to be magnets
Magnets 3 : Min max - A less loaded column surrounded by two heavily loaded columns.
Magnets 4 : Transfer of polarities across rows

Arrows 3: 3 in the center gives good starting point
Arrows 4: Interaction of two large numbers in the corners (4 and 5) along with the smaller numbers int he remaining two corners (2 and 3)

Anglers 2: Parity - Only one angler can reach the fish on bottom left as it has different parity compared to all other fish
Anglers 4: Reach ability of top left fish to an angler

Multi-anglers- Count of total number of anglers and how many anglers can reach each fish.

How well did the variants represent the theme of the test ?	variations represented the theme well
What was your opinion of the distribution of easy/hard puzzles?	Too many hard puzzles
What did you think about the puzzle quality of the test?	Very nice
Which set of puzzles did you like the most?	Hashi
Of the puzzles you solved/attempted, how well did the point values reflect the difficulty?	Most puzzles were worth the right amount
What was your opinion of the booklet formatting and printing?	Just right

How well did the variants represent the theme of the test ?	variations represented the theme well
What was your opinion of the distribution of easy/hard puzzles?	Too many medium difficult puzzles
What did you think about the puzzle quality of the test?	Very nice
Which set of puzzles did you like the most?	Arrows
Of the puzzles you solved/attempted, how well did the point values reflect the difficulty?	Most puzzles were worth the right amount
What was your opinion of the booklet formatting and printing?	Just right

Solutions booklet uploaded.