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i dont understand the double jump bit , im stuck on the screen next to the shop and cant get onto the bouncy block - the double jump doesnt seem to get me high enough ?

You have to do both high jump and double jump.

What Hypernova said. There was also a bug caused by GameMaker that would allow you to double jump just by holding jump, which was unintentional. I've tried to fix that with a workaround so it should be less confusing now.