Board Thread:Plants vs. Zombies Wiki Discussion/@comment-4009269-20140213201430/@comment-25448560-20140807063747

The Zombie O.O wrote: Sorry for stupid question, but what ARE tiered zombies? If they are in a higher tier, does that mean that you are in a different difficulty? Tiered zombies have more health depending on tier.

Tier 1 is normal, while Tier 2 & 3 is upgraded.

Zombie tiers are only far future levels and collecting levels like yeti and garguantar (depending on the difficulty).