I've just been to the toy shop with my 4yo to get him something small as a reward for his first week of school.
We've ended up with some dinosaur smasher eggs - I can't express in words how frustrating and awful they are! So fiddly that each one takes me about 10 nightmarish minutes to re build (with the help of an egg cup, absolutely impossible without) and then takes my son 3 seconds to re smash.
If you're looking for a gift that will ruin the day of the recipients, look no further.
https://www.thetoyshop.com/animals/dinosaurs/Smashers-Dino-Island-Smash-Eggs-8-Pack-by-ZURU-%28Styles-Vary%29/p/556447?gclsrc=aw.ds&gclid=Cj0KCQjw6CYBhDjARIsABnuSzqcLUMuTLS3CLq3SEFKGvQ62WmeU0oXXjy6W41JpXazlCPHVekyP6saAt27EALww_wcB&gclsrc=aw.ds