Scratch

This project should answer alot of your questions:

http://scratch.mit.edu/projects/archmage/72848

Here's a topic on jumping: http://scratch.mit.edu/forums/viewtopic.php?id=16077

ok, let me try to clear this up. in my game i want an eraser tool. example, the pen tool needs to be erasable. i want it so you can move the camera around when you are building stuff so u can have bigger levels. and when you move the character it will center on the sprite. does this help at all? i have the pen made to follow the mouse and work when the mouse is held down. and i need to know how to make gravity. this is a side scroller kinda game and should make you fall until you land on a line. is there a script to make an object that the sprite will walk on? and can i make a toolbar on screen that will follow the camera and look like it doesn't move? and i don't want it to interfere with the game. on this toolbar i want to make things like currency that you just drag and drop (kinda like the buttons on scripting) so if you don't want it you can drag it back to the toolbar and it'll disappear. and if you can make different lines like accelerated lines and trampoline lines? and make objects that kill the sprite. and a respawn point (so you don't have to reset the whole thing) oh and maybe a vehicle system where, say, a bike, will accelerate as it goes and you can make HUGE jumps! and a button to get on it (but you have to be in front of it). maybe like a helicopter or a plane & cars and stuff. How much of that can i do?