Jump when you see them appear
As long as the UPS has power. UPS's have different run times.
The second powerup in Temple Run 2 can either be unlocked with points or the player can purchase the power up if they do not, or can not unlock it with just their in-game skills.
In the store (access at menu or game end screen) you can buy power ups with coins and some are permanent whiles others are consumable. For permanent powerups you have to run through them in game play for them to work.
No. They are just more valuable coins. These are the coins from least valuable to most valuable: yellow, red, blue.
Tilt your phone to right to go right and left to go left. Swap your finger upward to jump and downward to crouch. Collect coins and power-ups in the way.
Like any battery powered device Universal Power Supplies do run out of power. The smaller the UPS the less time it can give you.
press b or the other letters
You never run out of whatever item you get.
No. Temple run 2 is the newest.
UPS: Unlimited Power Source, Uninterrupted Power Source. Your power should still work if you have a UPS. After all a UPS is UNLIMITED!
There isn't a labeled Temple Run 3 but Temple run Oz is basically what I consider it to be.