https://snap.berkeley.edu/project?username=d1ngusdangus&projectname=Sonic%20The%20Snaphog
I pressed space... and I have no idea what I got? How do you play the game?
Very nice !
In the scene "Sonic the snaphog", expand this block:
and you will get this:

now you can do this:

(this switch the scene and depress the green flag for you!)
You need to press enter on the title screen.
Oh okay thank you!