I've just started out with my first game in Unity. It's a simple 2D Platformer with a tile-based level.

enter image description here

When coding in the movement, I used the Physics2D.OverlapCircle() and an empty to check whether my player was touching the ground. However, I need to use a layer to make sure only the ground is detected.

my code below

//fixed update used for physics calculations
void FixedUpdate()
    //right or left arrows being pressed
    float moveX = Input.GetAxis("Horizontal");

    Vector2 moveDir = new Vector2(moveX * playerSpeed, rb.velocity.y);
    rb.velocity = moveDir;
//update used for spacebar input and force
void Update()
    if (Input.GetKeyDown(KeyCode.Space)) 
        rb.velocity = Vector2.up * jumpForce*Time.deltaTime;
    //is my circle overlapping any other colliders
    Collider2D collider =  Physics2D.OverlapCircle(feet.position, checkRadius, groundLayer);

When I tried assigning layers to my tiles, I couldn't find a way to do it.

I would be really grateful if anyone could show me how to, or if anyone can tell me a more efficient way to deal with jumping in a 2D platformer.

  • \$\begingroup\$ Have you considered placing a second tilemap under the same grid for your non-walkable tiles? \$\endgroup\$
    – DMGregory
    Sep 13, 2020 at 12:35
  • \$\begingroup\$ Thank you for your help! It's working wonderfully right now. \$\endgroup\$ Sep 26, 2020 at 1:21
  • \$\begingroup\$ I'm glad you've solved your problem! Want to write up your solution as an Answer below to help future users? \$\endgroup\$
    – DMGregory
    Sep 26, 2020 at 1:23

1 Answer 1


I'm Assuming you are using tiles as prefab. So just change the layer of walkable tiles in the main prefab.

Also, you can manually add the layer via script.Referance

Make a tile script and add it to the tile prefab.

  • \$\begingroup\$ From the screenshot, it looks like they're using a tilemap component, not individual prefabs per tile. \$\endgroup\$
    – DMGregory
    Sep 14, 2020 at 12:13
  • \$\begingroup\$ Yes I am using the tilemap system. Thank you for your help anyway. \$\endgroup\$ Sep 26, 2020 at 1:21

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