Collision for a block maze script C#

Questions & Answers
1

I’m building a game for a project for school. I had the idea for a maze game with a couple twist and turns. The Idea for the script is to press one of the WASD keys down and you would move one space forwards. I got this but it has no collision. I need to know how to move a set amount with one press of a key.

The script

using UnityEngine;
using System.Collections;

public class MazeController : MonoBehaviour {
	void Update () {
	   
		if(Input.GetKeyDown("d"))
		   transform.position += Vector3.right;  
		   
		if(Input.GetKeyDown("a"))
		   transform.position -= Vector3.right;  
		   
		if(Input.GetKeyDown("w"))
		   transform.position += Vector3.forward;
		  
		if(Input.GetKeyDown("s"))
		   transform.position -= Vector3.forward;
	}
}
2

Assuming on what exactly you want to do, I can suggest 2 solutions:

Your maze will be built of tiles, your character moves exactly 1 tile every time.

Don’t use colliders or physics at all, store your maze in a 3d bool array (whether or not each tile has a wall).
Then when the player tries to move, move him first in the array - if there is a block there, don’t allow the move.

Your maze will be built of irregular sizes, movement will be irregular or you want to add more complex behavior

Put a rigidbody + collider on the moving object.
Put colliders on the walls (no need for a rigidbody as they are fully static).
Then inside FixedUpdate (not update), use rigidbody.AddForce to move your character