cool bro, i figured that part by myself (i mean coacroaches problems solution as well as zombies outbreak solution), but what i have to do to make 4 level of tenants to appear, i maean, for level 2 tenants i had to buy a freakin pcs in the houses, for level 3 tenants to appear i had to, build a school, what about level 4 tenants? cm'on man help me out with that.ok?
To be able to breed the next level of tenants, you need a computer in the house. This applies to all tenants level, from 1 to 5.
If you build a school, then you don't need computers anymore to unlock the next level tenants and as the computers, this applies to all tenants level.
So, if you already built a school, then you already can use your level 3 tenants to breed level 4 tenants.