Timer to measure game length

Questions & Answers
1

How do you create a timer that measures how long you are alive for?
I need this for my survival game as the time is measured on the highscores page

2

float time = 0;

void Update()
{
    time += Time.deltaTime;
}

Or, alternatively (a method I personally don’t like because it can’t easily be paused, amongst other things)

float startTime;

void StartRunning()
{
    startTime = Time.time;
}

float GetTime()
{
    return Time.time - startTime;
}
3

If you simply need the time since your level started you can call : Time.timeSinceLevelLoad