Lingyan203 is doing a playthrough of both SoD Extreme I & II on Youtube. You can watch all the videos of the levels HERE. At the time of writing, he has finished playing through the first SoD Extreme completely, and has just completed 3 levels of SoD Extreme II. But I imagine it won't be long before the second set is completed as well. Enjoy!
UPDATE: FrauBalames88 has started her 100% walkthrough of SoD Extreme II as well. You can watch level 1 HERE.