/// create_gamma(x, y, id, facing)
met = instance_create(argument0, argument1, oMGamma);
met.facing = argument3;
met.myid = argument2;
with (met) {
    set_monster_vars(argument2);
    shell = instance_create(x, y, oMAlphaShell);
    shell.sprite_index = sMGammaShell;
    shell.damage = damage;
    shell.hpush = 5;
    shell.vpush = -3;
    event_user(3);
}
if (global.monstersalive == 0) {
    sfx_stop(sndMGammaIntro);
    sfx_play(sndMGammaIntro);
    mus_gamma_monster();
}
global.monstersalive += 1;