Click the green flag to start. All the other instructions are in the project. There is also a thing that happens when you start the level where you can not get to the ground. To stop this from happening just click on the left arrow key when you start. All advertisements, unchanged remixes, or mean comments will be reported. The music for this platformer can be found by searching green_girrafe2019 on scratch and clicking on my name then looking at my projects and finding music for poison--A platformer.
Thanks to @mattgv_test my brother's test account. None of the levels are impossible-I have tested all of them.