Top Laptops for Developers in 2026: The Ultimate Guide for Coders

Unity Interstitial Ads Integration Tutorial

In this tutorial, you will learn how to integrate interstitial ads into your Unity project using the Google Mobile Ads SDK. Interstitial ads are full-screen ads displayed at natural transition points in your app, such as between levels of a game. Below is the complete C# script with detailed explanations and a "Copy Code" button for easy use.

Step-by-Step Explanation

1. Initialize the SDK: The MobileAds.Initialize method initializes the Google Mobile Ads SDK.
2. Load an Interstitial Ad: The LoadInterstitialAd method handles ad requests and ensures that ads are ready for display.
3. Show the Ad: The ShowInterstitialAd method checks if an ad is ready before showing it to the user.
4. Event Handlers: Ad lifecycle events like impressions, clicks, and fullscreen closures are logged and handled.
5. Reload on Close: The RegisterReloadHandler ensures a new ad loads after the previous one closes.

Unity C# Script

using UnityEngine;
using GoogleMobileAds.Api;
using System;

public class InterstitialAdManager : MonoBehaviour
{
    public string InterstitialID = "";
    private InterstitialAd _interstitialAd;

    void Start()
    {
        MobileAds.Initialize((InitializationStatus initStatus) =>
        {
            LoadInterstitialAd();
        });

        Invoke("AutoShowAd", 5f);
    }

    public void LoadInterstitialAd()
    {
        if (_interstitialAd != null)
        {
            _interstitialAd.Destroy();
            _interstitialAd = null;
        }

        Debug.Log("Loading the interstitial ad.");
        var adRequest = new AdRequest();
        InterstitialAd.Load(InterstitialID, adRequest,
            (InterstitialAd ad, LoadAdError error) =>
            {
                if (error != null || ad == null)
                {
                    Debug.LogError("Interstitial ad failed to load: " + error);
                    return;
                }

                Debug.Log("Interstitial ad loaded.");
                _interstitialAd = ad;
                RegisterEventHandlers(_interstitialAd);
            });
    }

    public void ShowInterstitialAd()
    {
        if (_interstitialAd != null && _interstitialAd.CanShowAd())
        {
            Debug.Log("Showing interstitial ad.");
            _interstitialAd.Show();
        }
        else
        {
            Debug.LogError("Interstitial ad is not ready yet.");
        }
    }

    private void RegisterEventHandlers(InterstitialAd interstitialAd)
    {
        interstitialAd.OnAdPaid += (AdValue adValue) =>
        {
            Debug.Log($"Ad paid {adValue.Value} {adValue.CurrencyCode}.");
        };

        interstitialAd.OnAdImpressionRecorded += () =>
        {
            Debug.Log("Ad impression recorded.");
        };

        interstitialAd.OnAdClicked += () =>
        {
            Debug.Log("Ad clicked.");
        };

        interstitialAd.OnAdFullScreenContentOpened += () =>
        {
            Debug.Log("Ad opened fullscreen content.");
        };

        interstitialAd.OnAdFullScreenContentClosed += () =>
        {
            Debug.Log("Ad closed fullscreen content.");
            LoadInterstitialAd();
        };
    }
}
        

Copy the script above, replace InterstitialID with your Ad Unit ID, and attach the script to a GameObject in Unity to enable interstitial ads in your project.