Markus Mertama is a Finnish mobile phone/ Symbian OS programmer who created CDoom for Nokia 9210 with Hannu Viitala. According to Hannu Viitala, Markus made the Launcher application for CDoom.

Markus has also programmed the evolved version of CDoom, C2Doom, which supports most, if not all, of the new generation Symbian OS phones.

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