PIRATE INVADERS (2024) ZX81 16K

This game works on a ZX81 + 16k RAM. It's the 1700's - You are the Captain of a sailing ship which is constantly being overrun by pirates. Your job is to shoot as many pirates as possible with your cannons - you can only fire one shot at once, and level by level the pirates speed up as they get more belligerent. If they reach the bottom they board your ship and you lose a life. Watch out for the shark which is worth 10 points. Pirates are each worth 1 point and you have to have a "head shot" to kill them.
The game was made by Adrian Pilkington in 2024.
Download here: adrianpilko.itch.io/zx81-pira...
Huge playlist archive with ZX81 games: • ZX81 Games

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Nautical theme space invaders

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In one of the Discworld books, there's a scene of the librarian playing some kind of clockwork arcade game called Barbarian Invaders.