Drag 'em around, they'll stack together (the reporter/bool blocks will just sit there, but whatever). If you need different blocks, click the reload button to randomize the unused ones. If you put them in a stack, clicking the first one will make them all happen in order. A big chunk of the stack blocks do something, and the green flag and this sprite clicked blocks also do something. Oh, and I haven't decided how to do C-blocks yet, so for now they'll show up as normal stack blocks.
