In Temple Run 2 for the Android & iOS systems (iPad, iPhone, etc.), leveling up has one primary function.. unlocking better Power Ups.
There’s only one way to level up in Temple Run 2 though, and that’s by completing Objectives.
Go to the Menu and click on Objectives. These are your current active objectives, and you have to complete these to unlock more.
Every objective you complete adds another point to your score multiplier, and adds a portion to your next level.
So get out there and start completing those objectives, and get yourself some levels!