You can only purchase each NC map once. Likewise, you can only rent one of each type of NC tower at a time. Once your rental period for an NC tower has ended, though, you can purchase it again, if you like.
You can only purchase each NC map once. Likewise, you can only rent one of each type of NC tower at a time. Once your rental period for an NC tower has ended, though, you can purchase it again, if you like.