After our testing we found a few ways to improve the zombie tower.

• There were zombies escaping from the top of the tower and falling down the side so we adjusted some of the ruined sections to keep them inside the tower.
• The first floor was small enough that the zombies would wander out too quickly. We added an entrance area to expand the first floor and keep the area darker.
• The floors were slabs which allowed light through during the day. This cut down on the spawn rate so the upper floor was changed to full blocks.

Here’s some shots of the updated tower-

Normal zombie farms in Minecraft are handy for rotten meat and quick experience but if you want to have fun while farming this is a great way to do it.