Few games reward innovation and creativity like BioShock 2.
You could plough through the depths of Rapture by treating it as a straightforward shooter, but that would mean you'd only be skimming the surface of what this vast game has to offer. Here are some tips to help get those creative juices flowing...
1. FONTAINE'S SECRETS
Some of BioShock's best secrets can be found in the offices deep within Fontaine Futuristics. Look out for a mounted moose head - this can be unscrewed to reveal a safe - and an Unstable Transportation plasmid hidden on a cluttered desk. It doesn't deliver on the label's promise, but it's worth hunting down.
2. FOLLOW YOUR EARS
BioShock 2's levels are less linear than the originals, but finding the hidden bits requires a fair amount of detective work. To help you out, the designers have strategically placed the dial radios near secret locations. Follow your ears and you'll never be too far from the next unexpected bonus.
Instead of splashing out on five or six different plasmids, it's a much better idea to just build up one or two, as there is now a more pronounced difference between, say, Winter Blast 2 and Winter Blast 3 (in its final form, it is now capable of freezing its targets in a block of solid ice).
4. INVEST WISELY
Gene tonics cost less ADAM than plasmids, and the right ones can prove infinitely more useful. The best ones to spend your hard-earned on are those with permanent effects (cheaper vending machines, first-aid kits also replenish EVE, etc), and you'll want to slow down the hacking needles towards the game's end.
5. HITCH A LIFT
The multiplayer-exclusive Geyser Trap plasmid initially looks like a watered-down Cyclone Trap, but it's far more versatile. It can be used on yourself to springboard up to higher levels, either to surprise your enemies or to buy extra seconds in Capture The Sister. But beware: using Geyser Traps makes you more susceptible to electric attacks.
6. THE ULTIMATE BETRAYAL
It can be tempting to harvest Little Sisters on the spot for a quick ADAM boost, but to maximise your bounty, first act as a bodyguard as they extract yet more ADAM from a nearby corpse (tripwires are your friends here) and then harvest them at the vent. Hey, who's to know, right?
7. DROP YOUR WEAPONS
On higher difficulty settings, you may find EVE and bullet supplies equally scarce. Side-step this by investing in the Drill Specialist gene tonic, which disables your guns entirely, but significantly decreases your plasmid's rate of consumption, effectively allowing you to play as a mage class.
8. BECOME A COMBINE HARVESTER
Project Delta's ability to use both a plasmid and a firearm simultaneously opens up a whole new world of offence. Take a fully-powered Cyclone Trap as an example; you can either wreak havoc by firing bullets into it, or form an impromptu firestorm by casting Incinerate into the eye of the storm.
9. FLY AWAY
The Geyser Trap can also be used in conjunction with another multiplayer-exclusive plasmid - the Aero Dash - to further increase your mobility. Once you've activated the Aero Dash, you can't alter the direction of travel, but if you hit a Geyser Trap, you'll perform the equivalent of a double-jump.
10. TAKE A PICTURE
...it'll make your ADAM supplies last longer. In multiplayer, you should always take time to research fallen foes, as the extra ADAM reward far outstrips the risk. The only more lucrative ADAM supply comes from taking down someone wearing a Big Daddy suit, and that's often more grief than it's worth...