Dolphins Rescue Mission is LEGO set 41378-1. It has a score of 100. This is good compared to all other sets. The set is recommended by 3 reviews, based on 2 scored reviews and 3 reviews total. It is ranked in the top 0.13% scored sets on Brick Insights. We know this set was released in 2019, and it is categorised in Friends.
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I love the Lego Friends line! While they seem to be targeted at girls, there are a lot of sets that aren't girly girl such as this one. The mini figs are both girls, but you could easily substitute other mini figs to play with. Marine biology is a popular career interest for kids these days, so this allows them to explore that option a bit. It also allows for lots of creative play. This set is interesting as well as fun. It didn't take too long for my 18 year old daughter and her younger (8 & 10) cousins to build. They split up the jobs. They found this set a lot of fun to play with after it was completed.
My 4 year has not had more fun with Lego before than playing with this set. She's got lots of horse related sets from the Friends line, but this submarine set with the dolphins really hit the spark. She's done countless rescue missions and keeps expanding her storyline. As a Lego Parent/Fan it is a joy to watch.
As for the build experience, I have to admit I thought this was pretty typical - until I got to the last part of the build, the shipwreck. That part is a fun and enjoyable build, and I think the final version looks fantastic. I really like how the Friends designers are using the coral sea life to great effect in these sets, and for a small build the shipwreck looks quite good. The age range for this set is 6+, and I would recommend this set even for some of the older girls as the build will not be boring for them. I would recommend this set for the shipwreck alone!