Scratch Level 3- Pong

Project Page:
https://scratch.mit.edu/projects/189343657/#editor

1. I had some difficulty with sending 2 messages and making the game start once the correct buttons were clicked. The messaged I wanted to send were the ones explaining how to play single mode or 2 player mode, I had been able to create the messages, but wasn't able to make the buttons function properly. But in the end, I was able to get these fixed, by having the "say____" codes together in the same event tab. However I wasn't able to make the 2 player mode message disappear after space is clicked, I was only able to make it disappear after a few seconds. 
Another problem I had was that I wasn't able to get the ball to return to the centre after it bounced off the wall. I wasn't able to fix this, I tried re-watching the tutorials, but even after I had added the codes, the problem was still occurring.

2. I changed the colour of the ball, and changed some slight things, like: starting speed and it's increments. Which I made 8 instead of 10 and changed the mod to 4. I made these changes because I felt the game was already starting fast, and after a few bounces back and forth it became too fast.