Analysis of Extra Keys

This one-star logic puzzle with 4 noun types, 5 nouns per type, 3 links, 19 facts, and no rules. It needs 150 marks and 6 grids.

This puzzle is fairly easy to solve once the links have been determined. The links for this puzzle are "with", "before, but not just before", and "before". Level 1a enters 16 marks, and the rest are entered by the laws.

This is a simple puzzle with more than one link.