Nails. I don't know how anyone ever got through this without 99 lives and a plethora of cheats. I've only played briefly as an adult but remember as a child getting really stuck in the mid game with the complexity and unforgiving nature of the platforming.

Its one of the first games I watched my mum play and will always have a lasting impression on me, so my review may be more favourable because of that.

Intend to one day go back and see if it's completable or not for me.