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if i want the character to jump when i press space! is it? "yvelocity = -8;"
but if i write that script the character jumps out of sight. i just want it to jump a little bit! please help me!

You must a new user...
So simple

Make 2 actor, "player" and "platform"

Put this actions on "player" actor :
1. Collision Event with platform : 1 1 0 0

2. Draw Actor>Script Editor
yvelocity=yvelocity+0.5;

3. Key Down>Space>Script Editor
yvelocity=yvelocity-8;

Hope help

here on collision with topside of ground have physical response repeat while colliding yes and it will show 4 : 1's. the 3rd 1 change to 0.
then another collision with top side of ground have script editor:

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canJump = 1;

then add a variable called canJump
then on keydown space or up which ever use this

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if (canJump == 1)
{
    yvelocity=-17;
    canJump = 0;
}

then add gravity on draw actor of your player:

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yvelocity=yvelocity+1;

trust me on the gravity these codes will prevent repeated jumping