Video Game Cloning: the Nightmare of Trademark Law
While these reasons alone are enough for you to seek out an attorney and register a trademark for your video game title, know this: legal protection even protects the actual game itself! By the actual game, we're talking about characters, levels, power-ups, that sort of thing.
In Other Words, DON'T Use Mushrooms in Your Game as a Power-Up
Nintendo's already done it with SUPER MARIO.
Video game cloning is a clever way for game manufacturers to take advantage of winning aspects of major brands without even using recognizable characters or gameplay. Thankfully, trademark registration actually makes it that much harder for someone to clone your video game, saving the stealer time, money, and creative investment.
It's the equivalent of a hack. Steal the code. Create a game all at once. Simple. And then the manufacturer calls it something completely different!
Again, Cloning IS Against the Law and Can Be Pursued Legally
Hire an attorney. Ensure your rights are protected. When you trademark your game title, chances are pretty good others will view your work as untouchable. And that's a good thing!