Build 1542880

Dear Pong fans, HAPPY NEW YEAR！

What's new in version 0.2.03:

1. Updated "Endless Mode"
AI is happy about his new toy

2. NEW “Steam Achievements”

3. AI will become your teacher in "Guide Mode"

4. AI will react when hit by a ball (you should try it :))

5. Added tips on using controller
6. Added “Game point” and “Deuce” reminder in every game
7. Fixed problems related to serve
8. Fixed inverted curve balls
(Many thanks to Ludd’s feedback, how do you feel about the new curve ball?)