call of duty like waves(how do i)

/hello please help im am wondering how would it be possible to create different waves in a zombie survival game for instances:

1 after all 25 zombies are killed pause layout bring up "round 2" ect

2 start up again on the same layout add more zombies to the round and continue on with only 25 aloud on map but more than 25 zombies before another round????

i made an endless wave tower defense.

It is actualy quite easy. Set monsters for a wave and keep a current wave variable (initialise it on 1). Every time a monster dies. Monsters-1.

If a wave is over:

if monsters = 0.

CurrentWave+1 -> set monsters <amount>. Let's say currentwave*5

set waveText -> "Wave:"&CurrentWave& " monsters: "&Monsters

repeat untill player is dead..

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Pro tip: For spawning the monsters keep an extra variable OnScreen or something and set it to the amount of monsters

so set OnScreen = Monsters.

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For spawning them:

Onscreen>0

-> MonsterSPawner spawn "Monster".

-> Subtract 1 from Onscreen.

so a wave global variable then subract from that when zombie is on screen?

also want "text) round 2ect once they are all killed up there health and number over everyround

i made a small example

dl.dropboxusercontent.com/u/3961018/wavethingy.capx

just make then follow your character instead of end. And et them check a new path every so often