I know there is a lot questions about it, and "how to". I couldn't find any detailed guide with pictures about it.
"vectorY < 0, set vectorY to vectorY / 2. "
it's not enough to understand how to do it actually... please for the last time someone could please put some instructions with pictures how to make a long\short jump by how long you are pressing on space for example?
Also for Scirra if all your tutorials will be more detailed even if the guide will have more then 20 pages people will be more likely to buy it.
Also it'll prevent the flood of question like mine.