I remember playing and loving Wonder Boy 3: The Dragon's Trap on my Sega Master System when I was 10 years old or something.
The only thing was, to get to the menu, you had to press the pause button on the console. Jiggling the console would sometimes break the connection between the cartridge and the contacts and the game would freeze. Not to mention SMS dpads were garbage that regularly broke. Oh, and I had to plug it into a CRT via some little box that I had to screw to antenna connections on the back and the picture quality was meh at best. Which actually helped because the game is pretty low resolution and kinda ugly sometimes. At least until my CRT started to go and the left side was smeared across the screen.
Still, absolutely fantastic game, and I would really recommend the remake they did a little while back. What I would not recommend is playing it on OG hardware because it was a terrible experience mitigated by the fact that the game is great. Nostalgia, of course, only focuses on the good things we left behind, and not the awful.