All testing is done with collision-poly not with pixels..

Velocity is not speed?

Hmm, the Manual says it is:

VelocityX

VelocityY

The current speed of the physics object, in pixels per second.

So VelocityX is the speed in pixels per second in the horizontal direction

VelocityY is the speed in pixels per second in the vertical direction

Simply a matter of combining the two vectors to get your direction

If you are not sure yourself, I can't be sure either..

I haven't got a clue which databases and keys (foreign and or domestic) you are talking about..

As this doesn't seem to have a lot to do with getting things done in C2, it might be better to put this topic in general game design or something..

If there are no relationships, you can't make a diagram of it..

If there are, you can..

What are the relationships within a game you'd like to make a diagram of?

What would you need it for?

You can perform all actions on conditions you make yourself..

In the manual it says VelocityX and VelocityY, but maybe I read it wrong..

Yep you can check if ObjectA is overlapping ObjectB

Just add an event ObjectA is overlapping ObjectB

You should only trigger the animation when needed by adding conditions and variables..

You should also make events to stop the animation when needed..

You should only add to the score if game is not game over, so adding an extra condition would help..

so if player is alive - add to score

wouldn't adding actions to set variable and/or frame do that job?

Something like this?

Create round sprite at player.x, player.y

set a variable Xplosion to 1

system if Xplosion = 1

• round sprite set width to roundsprite.width+1
• round sprite set height to roundsprite.height+1

Sounds like a picking problem to me..

How is C2 supposed to know which spritebox should be affected by which sprite?

Easiest way would be to put sprite and corresponding spritebox in a container..

I don't see why it wouldn't be possible, although ofcourse I don't know what you want to do besides making coloured hexagons..