I´ve played a little, this one works for me.

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string level_str = <testlevel.wmb>;
string level_str_2 = <testlevel_2.wmb>;
string newtonLevel_cls = <testlevel.cls>;
string newtonLevel_cls_2 = <testlevel_2.cls>;

function main()
{
freeze_mode = 1;
warn_level = 2;
wait(3);
level_load(level_str);
wait(1);
dll_handle = newtonHandle;
NewtonAddMap (level_str, splashscreen);
wait(3);
freeze_mode = 0;
mouse_mode = 1;
mouse_pointer = 1;
mouse_range = 1000;
while(1)
{
mouse_pos.x = POINTER.x;
mouse_pos.y = POINTER.y;
wait(1);
}
}

function levelchange
{
freeze_mode = 1;
warn_level = 2;
wait(3);
level_load(level_str_2);
wait(1);
dll_handle = newtonHandle;
NewtonAddMap (level_str_2, splashscreen);
wait(3);
freeze_mode = 0;
}

on_space = levelchange;

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I hope this is a part of what you need.

greets, fogman