in a games im always making walls or platforms drawings not sprites and they eather stick to it or bounce up and down
Ps. how do you make clear scrolling like press and hold a butten it starts moves one and then stops and then move again
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For platformer type movement see the sprite movement done right project. http://scratch.mit.edu/projects/archmage/72848
To get it to not stick you have to make the sprite move up when the bottom of the sprite is touching a ground sprite. Since scratch lacks co-ordinate hitTesting the best you can do is use colour sensing or make a sprite that follows the bottom of the player and if that sprite is touching the ground then move the player sprite up. Neither are great solutions but they are the best solutions available.
As for scrolling, go to the scrolling thread http://scratch.mit.edu/forums/viewtopic.php?id=2440
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