In the Zombie Arena Minigame Map, you objective is to fight off zombies, collect loot and trade them gold ingots use gold to buy more weapons, armors, and upgrade. That is basically everything there is to this map. There are 10 levels in total, and so spending you gold for upgrade is sort of important because the next level will be more difficult than the last. Make sure to kill off mobs and collect anything that you can as only by trading these drop can you get gold. And only with gold can you buy more armors and upgrade.
All credit goes to YoloGamer231453
How to play in the Zombie Arena?
There are 10 different waves mob zombies to complete. Each one is more difficult than the last.
Enter the arena by holding down your finger on the screen and the long-tap on the minecart on the other side of the wall.
Pull one of the levers on the wall to start a wave.
To keep up with the difficulty you can use the loot which you’ve obtained from the monsters to retrieve gold ingots.
Place the loot in the hopper to retrieve the gold ingots.
When you’ve got enough gold ingots you can use these to purchase new armor and weapon upgrades.