hello does anybody know the code to restart the level? by press r

I guess the easiest way is to reload it with level_load.

i used game_save and game_load for restart.
When the level is loaded i saved it and when i want to restart i load it.

function start_game()
{
mouse_mode = 0;
ent_createlayer("skycube+6.bmp",SKY | CUBE | SHOW, 0);
game_save("level",1,SV_ALL);
level_load("level1.wmb");
}

........


function restart()
{
game_load("level",1);
}

Why are you doing it this way?
It takes a long time to save/load levels and is not needed. It is better to use level_load like Lukas said or to reset all your variables, entities...

No, actually it's faster since it only load in game data instead of loading all data like level_load, which also reload all texture, mesh, sounds, etc.

how do i activate the function restart?

"how do i activate the function restart?"

...

But this is kindof inelegant... If you really want to avoid loading the level again, I'd rather reset all values and entites manually than using game_save/load.