This game works on a ZX81 + 16k RAM. Fast paced version of Manic Miner for the ZX81. It runs faster than the ZX Spectrum version, but comes in a little short with the 16k and therefore only features 11 of the 20 levels. It was made by Ales Martinik. Download here: http://jswremakes.emuunlim.com/Systems/zxsinclair/mmzx81.zip
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