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how can you make it so that you can only jump once?
they jump with (yvelocity = -1;) thx

Using the search feature on the forum to search for 'jump once' provides 143 matches. Here are a few good ones....

http://game-editor.com/forum/viewtopic. ... light=jump
http://game-editor.com/forum/viewtopic. ... light=jump
http://game-editor.com/forum/viewtopic. ... light=jump
http://game-editor.com/forum/viewtopic. ... light=jump
http://game-editor.com/forum/viewtopic. ... light=jump
http://game-editor.com/forum/viewtopic. ... light=jump
http://game-editor.com/forum/viewtopic. ... t=jump+air

If these dont help try a search yourself and see if anything jumps out at you (no pun intended ), if not post back!

okay,make a var called Jump(integer) and on the collision on the top side of the ground have this

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Jump = 1;

and when the jumping key is pressed have this script

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if (jump == 1)
{
  yvelocity -= 1;
  Jump = 0;
}

and that should do the trick

make a variable called jumping

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if (jumping == 0) yvelocity = -1;

then make a draw actor:

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jumping = 1;

then make a collision with repeat turned on:

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jumping = 0;

There are many different ways of doing this. This is just one of them

... I just posted somthing like that...... (I just realised that I poseted somthing after sombody else posted somthing bout' the same thing[only links])

Yup, only links. The code you guys posted is on most of those links. It also goes to show how many times the same question is asked and answered. We might as well add a dedicated forum called 'How to jump'

yeah makslane should have that in the platform game stuff for GE