Timer triggered by tile?

Questions & Answers
1

How do I make a tile that triggers a timer when stepped on.

2

You can use this method:

To create a simple timer you can use:

float time = 0;
private void Update()
{
    time += Time.deltaTime;
    Debug.Log(time);
}

ps: For the trigger to work properly you need to attach both collider and rigidbody to the object that is entering the trigger.
As for the trigger itself you just need a collider with trigger enabled.