Despite the most horribly out of tune music ever heard on a home computer - 'La Cucaracha', no less - this is a very enjoyable game.
You are stranded in an underground world of tunnels and ledges. The strange plants are mainly carnivorous and the local wildlife is a hungry pterodactyl with purple wings.
Luckily your little green legs are immensely powerful and enable you to jump enormous distances. Novices will generally leap straight into ptery's mouth, but a little practice gives you good chances of survival.
Very strange, though, that the game wasn't given the title it had on the Spectrum - Bugaboo.