re: klarlen - There are 4 ending screens that i have found:
1. Cure Zombieism (Laboratory)
2. Setup Government (City Hall)
3. Close Portal (Crazy Portal)
4. Reclaim Every Square (I did this after curing zombieism and continuing, don't know if its possible without doing that, since the last few squares are just teeming with zombies.)
 "AdVenture Capitalist"){kind=icon}
 "Rebuild"){kind=icon}