ROCKET BOOTS are essential for ARENA II and you’ll need them if you want to pass this one. Therefore, I’d recommend the boots are your first purchase.
Next you should focus on gathering enough money to buy the AUTO-TURRETS. Turrets will cost: 1. 500$, 2. 1500$, 3. 2500$, 4. 3500$. The prices increase by 1000$ with each purchase, the buying order doesn’t matter.
Starting with top AUTO-TURRETS, I focused on getting all turrets on one side before moving on to the next (I started on the left side). I didn’t buy any weapons, except for the RIFLE in later waves as an option to shoot from the distance whilst hovering.
In the first couple of waves, it’s enough to move little as enemies will come to you. Use your pistol’s secondary weapon feature to kill the enemies easily. Dodge the exploding bats if necessary.
Once more enemies spawn – including the whales – you will need to move more. Hover from platform to platform and allow the turrets to deal some damage. Every now and then use the pistol and get some multikills, as the enemies will line up perfectly. Whilst not necessary in the first couple of waves be sure to buy the HEALTH UPGRADE.
Wave 9 should give you enough money to buy either the GRENADE LAUNCHER or PLAZMAGUN – you need one of those for the BOSS FIGHT. I went for the LAUNCHER and finished off the level.
The Boss has simple move-pattern: he will charge you, once you evade, he will charge you again. However, as the boss moves with slow speed dodging and evading is not too difficult. He is shooting exploding missiles which rarely hit me.