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When I run my game,it starts off fine but soon it slows and crashes. Do the type of sound and picture files affect this? I am using .wav sound files and .bmp picture files that I created myself.

I use also .wav and .bmp, it's not about them. Have you saved your work before trying it?
If you try it in GE's Game Mode, it usually might run better if the work is saved.
Also, your game might have some error that doesn't matter for starting the game, but
during the game it will grow so huge that it makes the game crash. Would be easier to help, if
I could see the source of your game. Or is this happening with many games?

This the only game I have written so far. i do not know how to attach the data file to show the game.

it doesn't seem to crash or anything for me; Must be something with wrong your computer.
Your problem is a bit like mine: Games start off smoothly, but after a couple of seconds it starts lagging. Except games don't crash for me.
This bug happens to me because my dual core has a broken core on it, so it's not as powerful as it could be. Maybe you have a hardware problem as well?

I went through all the actors and removed the scripts that I didn't really need. I found out sometimes I had put the script in twice.
That cleared up the problem of the game slowing and crashing.