Many of these things will seem like old-hat to most of you here as this is a list mainly intended for players who are brand-new to the multiplayer. It's compiled of many of the little tidbits you wish people would have told you when you first started out so you didn't have to learn the hard way (you know, where you usually end up DYING first)
Please feel free to add new tips and tricks to this thread!
1.) The effects of the Incinerate and Insect Swarm plasmids can be cancelled by Aero Dashing.
2.) The effects of Insect swarm can be cancelled by hitting the melee button 3 or 4 times.
3.) A popular strategy to use in the lower levels is Aero Dashing into an enemy for a stun, then using shotty (prefered with 'rate of fire') to own them!
4.) A popular strategy to use in the higher levels is to Electro someone to paralyze them and lower their defenses, then score an easy headshot with the elephant gun!
5.) The big daddy suit doesnt spawn as 'random' as you might think! There are 3 designated locations for each map. Learn them for quicker grabs.
6.) Winter blast can freeze doors, slowing down pursuing foes.
7.) By constantly tapping the trigger, the nail gun can be kept revved. Just dont expect to be sneaking up on anyone sounding like a hoover!
8.) More then just a ground dash, aero dash can be used to traverse gaps! i.e. Move from one balcony to another.
9.) Geyser traps can also be shocked, so that they deal massive damage. ALSO if someone gets hit with one of your Geyser Traps, they are wet for a few seconds. Shock them for a instant kill.
10.) Woah! Not so fast! Two gene tonics take effect after a players death. "Death trap" makes a corpse explode after a few seconds, killing you if you're researching it or happen to be nearby. And "resurrection" brings players back to life! You'll notice people who have this equipped will fall to the ground in a funny way. Then their body will glow and their corpse will rise. Their health will be very low as a result so quickly melee them over the head to put them down for good.
11.) Geyser Traps can be used to jump to inaccessible places. So whenever you play a game like Team ADAM Grab, always make sure you go into the match with either Geyser Trap or the Leg Up tonic equipped because people WILL hide with the Little Sister in areas that aren't accessible to people who can't perform higher than normal jumps.
12.) You can freeze hacked Vending machines to disable the traps!
13.) Also, to negate the effects of an electrified Geyser trap, simply SHOOT the geyser trap and it will go off, allowing you to continue on your merry way! The same can be done with the detonating bombs that the Big Daddy sets. Shoot and they explode.
14.) If you see one of your teammates on FIRE, feel free to use Winterblast on them to put out the flames!
15.) Telekinesis can be used to launch rockets back at turrets. Also it can be used to pick up big daddy mines for your own use! Also, it can be used to catch homing grenades! ALSO, it can be used to catch bombs that fall out enemy vending machines. Just make sure you're already holding something with TK before you try to catch any grenades or rockets!
16.) Got the Big Daddy blues? Winter blast actually lowers defense. Try using it with a nail gun to bring em down! You'd also be surprised how effective melee can be on a frozen Big Daddy. (Insect swarm also blinds the Big Daddies very effectively.)
17.) If you Winter blast an enemy, then Aero Dash through them they will shatter.
18.) During ADAM Grab or TEAM ADAM Grab if you have the Little Sister while hiding and you know for sure a pursuer is right around the corner, you can drop the Little Sister by pressing fire button to start shooting your pursuer
19.) Death trap aka "the explodey thing" is unlocked at level 38. and is well worth it. You know all those enemies you see researching your body on death cam? lots of em blow up
20.) For maximum effectiveness on Geyser Traps, place them on a place where the space is very tight and closed in. The smaller the place, the harder it will hit the roof / wall (Don't forget to electrify them).
21.) You can tell a vending machine is sabotaged by a red light on its right side. A blue light means a teammate has sabotaged it (you can still use it). A yellow light means no one has sabotaged it. However, if you join a game that's already in progress, there's a glitch in the multiplayer that will show a yellow light even for vending machines that have been hacked by the enemy. Use caution whenever you join a match that's already underway. This glitch goes away after your first death in the match (which will probably be by vending machine explosion!).
22.) If an enemy turret is firing at you, you can use incinerate, winterblast, electro bolt, or insect swarm to stun it for a few seconds so you can get close enough to hack it.
23.) You can research any dead bodies, not just the ones you killed. If no one else is there to claim it grab a snapshot.
24.) When you become the big daddy you have more attacks than just the rivet gun. Left trigger will throw a proximity mine. Very strong and if it hits someone dead on is an instant kill. Left Bumper is a stomp that will stun any close enemies. Very helpful if someone hits you with bees or keeps circling around you.
25.) Also, hitting up on the D-Pad makes your character groan like a Big Daddy, which does nothing. Just an easter egg