What is the ruling on building the Kaaba and the Sacred Mosque in an online building game, out of reverence for them?

There is no objection to building a shape of the Kaaba or the Grand Mosque in electronic games, as long as it is not done in a disrespectful manner, because drawing inanimate objects is permissible according to the general consensus of scholars. The hadiths explicitly prohibit the depiction of living beings, not trees or similar objects that do not possess a soul.