Imogen is an endearing and memorable BBC Micro action/adventure, published by Micro Power in 1986.
It was written by Michael St. Aubyn and features a wizard (who you play and is called Imogen) who can transform into a monkey or a cat to do certain things. Like solve simple puzzles.
The puzzles are relatively easy logic problems, and ‘find-the-right-item-to-get-you-past-the-guy-blocking-the-way’ type issues. Found items are manipulated via a menu at the top of the screen.
The graphics in Imogen are excellently drawn and move well. It’s a pity, though, that they are somewhat monochromatic.
As far as I can tell Imogen appeared on BBC/Acorn computers only, which makes it an iconic system exclusive.
More: Imogen on bbcmicro.co.uk