Click the green flag and click the "Help" button to learn how to play, even if you have played the previous versions, because this one is different. Also, the leaderboard shows the top 500 scores.
New Scratchers can't affect the leaderboard (sorry, Scratch doesn't want new accounts spamming the cloud server). This is the third version of Space Launch. Space Launch 2: https://scratch.mit.edu/projects/57685150/ Leaderboard Cloud Data: https://scratch.mit.edu/varserver/98631856 Credits: soundbible.com for most sounds
