When I was about 11, my best friend was a guy called James Brzezicki, who used to spend hours drawing out super-detailed level designs for platform video games. I copied him, although mine were never as good.
The real problem, though, was that when the drawings were finished we had no way of turning them into actual games. Neither of us was able to code, and the idea that it might be possible to create a video game approaching the quality of, say, Super Mario World was pretty unimaginable stuff.
Thankfully, technology has moved on a lot in the past couple of decades. Proof of this is the launch of a new iPad app called Pixel Press Floors, which lets you create side-scrolling platform games using nothing more than a few basic school supplies.