First shown at the December ZX Microfair, Krakatoa grabbed the attention of most passers-by because its wealth of detail is amazing. There's such a lot going on. And there's a lot to do in the game, most of it neatly shown in the excellent demo, which runs automatically after loading and between games.
Your task as a chopper pilot is twofold. A tanker is sheltering in the bay from attacks by V1 missiles and submarines armed with torpedoes. Across the bay the dormant volcano (hence the title) has come to life and is threatening to erupt. You must try to rescue as many people from its threat as possible. Your helicopter is equipped with a machine gun, depth charges and a rope for rescuing people. The game starts with the chopper on the ground on the heli pad, beside the workman's hut. When your fuel gets low and you return to the heli pad to refuel and re-arm, the workman dashes out and does it all in a very busy animated sequence. On taking off, you pass out over the bay and reach the massive tanker. It's crew start to leap overboard as soon as the enemy do them damage, and so pose another problem for you and your trusty rope!
Beyond the tanker is open sea, full of enemy, and the Volcanic Island with its hapless inhabitants. The screen shows all this in profile, scrolling as it goes, 'Scramble' style. To the left and right of the display area are ammo and fuel bars, and below are instruments including a radar display, and score.