Okay, downloaded, installed, copied WVGA level files from my dad's HTC Touch HD to my PC, opened them, works.
How do I convert them to Mokomazes level-format now?
I searched via google, but the only thing google finds regarding this topic is this very thread...
Before I start to create own levels I would like to try the converting with existing ones in the correct resolution.

edit: excluding "teeter" from the search query at google will find a little bit more.
The level files from teeter are only text files with numbers for the objects and coordinates. Just like the ones from Mokomaze afaik.
Maybe they're compatibel? Where are they stored on the N900?