Getting to the top was indeed extremely difficult (I had quite a LOT of luck there, sometimes I didn't even realize what blocks I was just touching). I don't have videos (even if I had them, you probably wouldn't see anything but flashing lights at the bottom because of YouTube's quality... lol). But I just tried to touch only green, yellow and red blocks, avoiding any other colors (as I said, that wasn't easy!). You have to be extremely fast, I don't think I would be able to reach that score again. For Ninja Mono stealth, widen your fins as much as possible to avoid tricky maneuvers around grey blocks.