Here's a script/tutorial on how to make a modular gun game that counts by kills.
There are only 2 GSC's in the attachment and that's pretty much all you need. Everything is handled inside of them.
To initialize the gun game script we have to call the init from _zombiemode.gsc

main(init_zombie_spawner_name)
{
----------
	maps\_zombiemode_auto_turret::init();
	//Load gametype here, can make it only work on a special condition using the if statement i.e. "scr_zom_gungame" or so.
	maps\_zombiemode_gungame::init();

Also add level.zombies_spawn_this_round ->

	level.zombies_spawn_this_round = max;
	//
	level.zombie_total = max;

to round_spawning()
That's all you need to start this gun game, everything is documented inside _zombiemode_gungame and well detailed. If there are any questions just ask.

1 question, how would i create a menu like on ugx mod so the players can choose classic or gun game? Ive never tried to edit the menu or anything so not sure how to go about it

1 question, how would i create a menu like on ugx mod so the players can choose classic or gun game? Ive never tried to edit the menu or anything so not sure how to go about it

Easy, so wherever you want to set the option you'd use menu function: CHOICE_DVARYESNO_VIS().
So something like main.menu

CHOICE_DVARYESNO_VIS(INTEGER FOR LINE NUM, "Gun Game: ", scr_zom_gun_game, ;, when( !dvarBool(ui_multiplayer) ); )

and inside the zombiemode call do if( getDvarInt("scr_zom_gun_game") == 1 )
Make sure to also define the var somewhere inside a config (preferably that's executed somewhere in main) and include that in the IWD.

Alright thanks! I will try that

awesome, I was only gonna add the current UGX mod due to this feature, now I know that is unnecesary youve saved me a headache