![Swift Game Development(Third Edition)](https://wfqqreader-1252317822.image.myqcloud.com/cover/391/36699391/b_36699391.jpg)
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Spreading your wings
Run the project. Tap the screen to make Pierre fly higher; release to let him fall. Play with the action; Pierre rotates toward his vector and builds or loses momentum as you tap and release. Terrific! You have successfully implemented the core mechanic of our game. Take a minute to enjoy flying up and down, as in this screenshot:
![Spreading your wings](https://epubservercos.yuewen.com/CA5549/19470388108855606/epubprivate/OEBPS/Images/B08760_04_002.jpg?sign=1738956215-9xUddMXCItav22SbL5Ih3sATOI0szTGD-0-70126a42d398191137b6ca645c188b81)