//objPlayer
//Step:
{
    gravity = place_free( x , y + 1 );
    if gravity == 0 and keyboard_check( vk_up )
    {
        vspeed = -10;
    }
    if keyboard_check( vk_left )
    {
        move_contact_solid( 180 , 4 );
    }
    if keyboard_check( vk_right )
    {
        move_contact_solid( 0 , 4 );
    }
}
//Collision with objBlock:
{
    x = xprevious;
    y = yprevious;
    move_contact_solid( direction , speed );
    vspeed = 0;
}
//objBlock
//Must be solid