A strange alien ship has been picked up on radar, heading towards the Earth. After three days it goes into orbit and fails to respond to radio messages. A preliminary scan reveals a large carbon dioxide laser, aimed at London. The Royal Navy attacks but all ships are lost when a strange wave of pink light radiates out from the ship.
Now the plan has been decided. A Space Marine must dock with the ship, plant a large mine and then teleport back before it explodes. Only then can the Earth be saved from the alien menace that hangs overhead.
You have been chosen for the mission and dock with the ship, armed with only a teleport bracelet and a limpet mine that must be attached to the laser to ensure maximum destruction.
Published as a type-in game in issue 52 of Computer and Video Games magazine.
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The version of this game stored at the bbcmicro.co.uk site is bugged if played online - if you input INV it crashes with a BAD DIM message. You can work round this by use INVE instead.
To be fair, the instructions do say that input words can be abbreviated to their first *four* letters.
Yes, but looking at the code shows that INV was meant to be recognised. The problem is with an ON ... GOSUB statement, where the line number corresponding to INV has been mistyped, leading to line 260 being executed twice. It's easy enough to fix, if you really want to use INV as in the walkthrough.