A walkthrough of the ZX Spectrum game, MASK. There's a bug on the third level: after destroying a laser barrier, your car is always blown away by a strong wind, and it's impossible to go further. POKE 41721,201 was used to remove this whirlwind and allow the game to be completed. From the recording originally sent to http://www.rzxarchive.co.uk/
Recorded using "rollback", a feature of the emulator which allows you to mark a point, which you can then roll back to later if you get into difficulty, and try again. More info. on the channel "About" page: https://www.youtube.com/user/rzxarchive/about
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