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Ok, click on the ground, and go into Properties. Find where it says "Instance Name" and call it "ground". Mario should now hit the ground. To get him to hit the surface, rather than go into it, you have to double click on Mario, and move all the different sprites up, above that cross.

Thanks its working now but it is not animating when i walk.

On the first frame inside the symbol, you need to make another symbol. In this symbol, you put the frames for walking animation, so when you press right or left, the animation plays.

Ive done it wrong way now its working thx.

Happy to help I guess I need to do my own work as well now