Games are all about ideas & their execution. Different ideas from different aspects of games like gameplay ideas, narrative ideas, presentation ideas all come together to create a single game and behind every successful game there is one or several ideas that have worked it's magic. Some ideas work, some do not, some are promising but because of poor execution are forgotten quickly and while some ideas are intriguing in the time of their debut, loses their value in the long haul. But there are very few ideas that not only worked when they debuted, they created a vision for other developers to expand further and helped push the boundaries of videogames. In some cases, these timeless ideas even helped create new genres of videogames. Below are the ideas that in my opinion, created the foundation, the lifeblood of the present gaming industry with their innovation & ingenuity. These ideas have been used & abused from the time of their inception & the deb...