So, I'm replaying the levels as I write, and... don't do what I just did. Run past everything and jump into the first challenge. You get shot by plasma really fast. The first part of the mission is sneaking, so no paint-gun for you. Anyways, listen to what the lil robot has to say and then watch out for the search lights. Let them swing away from you, then go hide in the nearest place a different layer of depth opens up. If you get caught in the light, the alarm will go off and there will be red targeting lasers and plasma everywhere! You also will forfeit extra prize bubbles, so for the bubbles, be sneaky and get to the next cover, and then out of the room.
Next room, same idea, avoid the light and get the presents. The next search light is on the back layer, so jump up to the boxes and then flip the switch on the top left. Then get to the door and get outta there! If you didn't get caught, collect the prizes, if you got caught.. maybe next time.
Now here is the end of the sneaking mission, because cmon... were all ps3 owners here right? How long could a ps3 exclusive not give you a gun. Anyways, go shoot some robot turrets!
This first turret can't hurt you unless you charge it so get used to how the paintanator lobs its ammo, and shoot the crate with a paint switch just on the wall above the thing shooting green plasma at you. Collect the bubble behind the dead turret and watch out, the next turret can actually kill you! So use cover accordingly and lob paint at it like your little sack life depends on it!
Get the next container thats hung from the wall by shooting it, but becareful when jumping down to get the bubbly contents, the turret will kill you in that space, so time it right, then jump down and take cover behind the nearest wall. (one layer up). After defeating the first turrent thats on the ground, by going in and out of cover, run under the mounted gun on the ceiling for an easy kill.
You'll soon run into a contraption, but don't mount it yet.. go get the bubbles past it. Shoot anything that needs shooting, and then get onto the 'seat' part of the cannon type thing. It'll launch you to the next area, much like it did for snake in MGS4. Go go go!
If you miss and hit spikes, you didn't do it right. Try another angle on the cannon thing and aim for the top! Then start shooting these ceiling contraption turret things. Becareful of the plasma of course. Theres 2 brains to each turret, so time those shots! Theres two more bad guys in front of you, one shoots up and the other at you. Take them out and move on, only spikes await you at the bottom of that pit! One more ceiling bad guy and you are in the next area. Before you jump anywhere, shoot the green dissolve material to make the platform lower. Go one more platform down but before going any further, theres some concealed bubbles off to the left, shoot to the left until you can walk through. Then head back to rinse and repeat to get your way outta there.
Now try and shoot some turrents in the distance, listen for the sound of the paint switch dying, and then try and kill 1 turret before jumping down. Now its just a matter of collecting stickers and dodging plasma to kill those pesty robots.
Until... the boss of the mission! Well of this level anyways.. Its a tank with spikes in the front, electric body and plasma spouting cannons on the top. So... keep your distance and dodge the plasma, and lob paint at the top part until its dead! Use cover when the plasma gets too hectic. When the top dies, the armor opens up and its going to use bombs this time! Cover wont help too much, so keep moving around and get a feel for the pattern it throws at you. Try and lob your paintballs into the very middle and you can even prevent the bombs from getting out of the case! Kill the blasted thing and collect your bubbles! Lets move on.