In the special features part of the game there is a music video by Cold called "With My Mind". (Amazing song) Anyway, not really a hint, but on the fears don't lie level (the first one in Hong Kong) When you enter the lift you will hear a chinese version of this song (i think it sounds terrible)
Bosses in this game can be a pain so here's some tips for some of them.
Jov Leonov. Use the cheat to unlock all powers and when he comes down the lift after you have destroyed all of the machines use PK on him three times to kill him.
Edgar Barret. Use the cheat to unlock any one of all the Edgar Barret skins to gain the ability to lift, block, throw and stop all the train carriages and heavy objects in the battle area. The General's skin also works.
Wei Lui. Use PK on the stone samurai's to stop their movement for a few seconds before you mind drain them. When she transforms use the infinite ammo cheat to be able to destroy her three heads quickly with an automatic weapon, to stop her attacking for a while use PK on her for a while to make her rampage across the room.
Nicholas Wrightson. Use the infinite ammo cheat and equip an automatic weapon. Once you have done this hide behind the box at the entrance and don't stop shooting at his computer screens.
The General. Use the infinite ammo cheat so that your new power will never run out during the fight. This way you only have to destroy one structure and you only have to find one sphere of power. When he uses his third attack he will dissapear and reappear later on with a quick almost unavoidable blast attack.
To avoid it use aura view when he dissapears and attack him, for some reason he won't use his blast attack afterwards. To avoid his other two attacks hide under one of the little bridges and leave to attack him between each one. With these tips you can finish the battle on full health.
Hello there I'm going to tell you a list of fun things to do in the psi-training room One.tele the big ball on the chain towards you then jump right at it causeing you too fly away! Two.get on top of a red bomb then tele it so you are telesurfing thow your self at a guard you and him go bye bye. 3.bring everyone to the psi room and see if you got what it takes!
To mind control/telekinesis(and any other psi power) elite meat puppets just pick up a box and knock them to the floor and then you can take control over them it's very usefull if you want to have a go with a flamethrower or use a rocket launcher. Note: You can't use flame throwers/rocket launchers or grenades unless you take control of enemys that have those weapons. Hope this helped you.