Make sure the font you are using supports chinese characters. If the font doesn't have the characters you want to use it usualy shows a bounding box.

On sprite3 clicked activate the sprite3 instance with the same x-coordinate. (even better would be just to spawn a new sprite at (sprite3.x,-100)) Start a timer and move when timer hits 10 seconds.

On key released - sprite (with platform behaviour) - set vector y - 0.33*Sprite.Platform.VectorY

would take care of the fine height control.

The platform behaviour is a good starting point and by setting the default controls to "NO" it has all the freedom you need to adjust it to your needs. There's no need to reinvent the wheel if you just want a different looking car.

Seems pretty straight-forward to me.

Give the objects you want to drag and drop the drag/drop behaviour and add an event that drops the object on its exact destination if it's close enough to that destination.

Look intro the anchor behaviour

Set paralex for the background layer to 0,0

There is a tutorial in the tutorial section about changing the loader layout.

Also you can change the settings for loader layout in the project settings.

Here's a dashed line example:

<img src="https://dl.dropboxusercontent.com/u/48563442/9patchdash.png" border="0" />

and settings:

<img src="https://dl.dropboxusercontent.com/u/48563442/9patchdashproperties.png" border="0" />

Tou could just use the car behaviour and set speed and acceleration. Use custom controls and set it so that the player can only use left or right.

Add the browser object to your project and try something like this:

Make an event

Browser on suspended - set timescale to 0 - make your dialog box visible

Dialog box on clicked - set invisible - set timescale to 1

Ok, I understand what you mean. That will be kind of hard to do. You would have to check if the combination of numbers that are on the screen can add up to the target-number.

I'm not a math-wizard, so I can't really help I think.

Maybe you could turn it around. pick three instances at random and add up their animationframes and set that number as target. Than you could keep the rest of the events as is..

I don't understand what you mean by the target.

The capx I posted above makes it so that when the total of numbers on screen goes below a certain value the target is adjusted to comply with the numbers on screen. I guessed that was what you wanted.