Seriously, a studio of ex-Rovio hats, has released its casual, free to play, tile-matching puzzler Best Fiends for iOS.

It's a story-driven if quite traditional puzzler mixed with RPG-like character progression.

It follows the story of a band of bugs fighting against the Slugs of Mount Boom in order to save their families.

Each puzzle has you matching tiles of the same nature-based icon - leaves, fungi, mushrooms - in order to collect the Best Fiends.

You'll have to form a team out of them in order to battle the slugs as they embark on their journey across Minutia.

Each of the cute bugs have special powers that correspond to the colours of the tiles that you match.

You're able to level the bugs up, evolving them (from caterpillar to butterfly, for instance) to improve their abilities.

You can download Best Fiends for free on the App Store right now.