Village Greens
DERVISH: Great for gnome mobs, if you can get it.
MANTIS: Wonderful damage ring, at low levels.
DIAGNOSE: Great crew heal ring, and you'll be crewing a lot.
SOLAR RAYS: Great for taking out cannons on hills, or attracting gnome mobs.
Gnome General
DEFIBRILLATE: For reviving dead allies. The Null Chamber is far away.
DIAGNOSE: Great crew heal ring, and you'll probably need to be crewed.
MANTIS: Wonderful damage ring, at low levels.
TEFLON SPRAY: To negate incoming damage from both boss and minions.
Bill's Ranch
SOLAR RAYS: Since there aren't many mobs, strong ranged attacks are effective.
MANTIS: Strong attack ring with no knockback. Good for combos!
Dead Man's Pass
DERVISH: Lots of mobs, knockback helps due to limited screen space.
DIAGNOSE: You'll be crewed, so it's a great healing ring.
OMGWTF
MANTIS: Strong single-attack ring. No need for mob rings.
HACK: If you can get a hold of one, it starts to become very useful.
DIAGNOSE: You'll be crewed, so it's a great healing ring.
Zen Gardens
SLASH: Strong ring; Good for taking monsters whilst avoiding cherry fluffs.
BANDAGE: Strong healing ring, whether you decide to crew or not.
SHARK ATTACK: If you can get it, large and hilly maps help this ring damage well.
Bass'ken Lake
DERVISH: You'll often be suddenly mobbed, so 360° damage plus knockback helps.
FIRE RAIN: Strong AOE, good to use in conjunction with Dervish.
DIAGNOSE: Team heal! You'll probably need to crew often, so this can help in that department.
She Wolf
HACK: Pure damage helps, especially since she has a slight health regeneration.
DEFIBRILLATE: People will die. Many times.
TEFLON SPRAY: Negates a fair bit of damage, allowing you to tank for a bit.
MEAT: The longer you stay alive, the more damage your team can do.
GHOST: More dodge means less run, means more attack!
Gold Beach
HACK: Good for any enemies that spot you. (Fewer mobs here, excluding Anchor Bugs)
FLEET FEET: Harder to escape here, making speed a valuable asset.
SHARK ATTACK: Strong ranged attack that's good for golems and fluffs.
Duneslam
HACK: Pure damage kills him fast.
SHARK ATTACK: Pure damage kills him fast from the hill.
Old Aqueduct
DERVISH: Takes out the plenty of mobs that appear from all angles.
SLASH: More AOE to help take out surrounding mobs.
BANDAGE: Helps you heal whilst still attacking.
The Hive
DERVISH: Attacks mobs in all angles, and helps steal some aggro.
TEFLON SPRAY: Keeps damage down, so you can survive stray hits.
DUCT TAPE: Helps crowd control monsters so the crew can attack.
Otami Ruins
DERVISH: Deals with coatl/terror mobs.
HACK: Deals with vases.
SHARK ATTACK: Deals with masks.
The Gauntlet
FLEET FEET: Speed, duh.
COYOTE SPIRIT: More speed, duh.
TEFLON SPRAY: Long-lasting deflection buff (as casting while running isn't a smart idea).
Stone Coatl
HACK: Beating this thing fast is a priority; This will help you do it.
MANTIS: Single attacks are a good idea, and this should help you kill the Coatl faster.
TURTLE: Knocks off incoming damage from all the monsters and the Coatl.
Shallow Seas
DERVISH: Lots of mobs in all directions. Enough said.
SHARK ATTACK: Ranged, in case you get stuck by those pesky Brain Clams.
TEFLON SPRAY: To deflect some of that damage coming your way.
Queen Lorelai
HACK: The usual case where damage does you well.
SHARK ATTACK: More damage, for the win.
DEFIBRILLATE: Because getting back to this point if you die, is a pain in the butt.
Undersea Ledge
DERVISH: Lots of small mobs. Nothing really you haven't beaten before, though.
HACK: Some pure damage, to help take out those subs.
DEFIBRILLATE: Because getting back to this point if you die, is a pain in the butt.
Walk to Sealab Compound
HACK: Pure damage, if you choose to attack.
FLEET FEET: Should you choose to run.
DEFIBRILLATE: Because getting back to this point if you die, is a pain in the butt.
Sealab Compound
HACK: Pure damage.
DERVISH/SLASH: Mob damage.
DEFIBRILLATE: Because getting back to this point if you die, is a pain in the butt.
Chapter Boss
HACK: Pure damage, especially since he has high regeneration rates.
SHARK ATTACK: Pure ranged damage, so you don't all get massacred by standing together.
DIVINITY: Since you're bound to use up a lot of stamina quickly.
TEFLON SPRAY: To lower the chances of getting 1-hit KOed.
DEFIBRILLATE: Because you'll need it.