Simple demo of the counter blocks. The sprite should count up by 5s from 5 to 25 four times in a row. The implementations for the counter blocks are here: https://github.com/LLK/scratch-vm/blob/8faad674396c906596e6a678c0c11fa4aa9f1333/src/blocks/scratch3_control.js#L181-L191 Very complicated, right? :P
