A walkthrough of the 2008 ZX Spectrum game, Mockatetris. Based on the classic Russian game (but with slightly different pieces). Complete each of the 9 levels by clearing 24 lines. After the level you are shown a mock screen of a game that never appeared on the Spectrum, but did appear on other platforms. The mock-ups show what these games could have looked like had they been ported to the speccy.
From the recording originally sent by Rafal 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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