Another amazing game was the second Mickey Mouse game, Land of Illusion.
The grapics where beautiful and the gameplay was great
Such a beautiful and good game ! I remember the first time using the rope, and the battle with a boss made of cards
This thread bring back so many memories, as the Master system II (with alex kidd inside) was my first console ever ! I had an original Master system few years later too...
My most played games must be :
Tennis Ace
Wasn't even that good but I played with my older brother all the time
Never finished it, the last boss was too damn hard..
When I was young, it seems that I had a lot of time on my hands, since I spend hours trying to find cheatcodes, shortcuts and hidden places in the few games I had. And I must say I still remember exactly these moments today

I found a kind of Konami code in
the Jungle Book (during the "Virgin" screentitle, but I can't remember what it did...)
In
Batman returns, in the first level
if you lose a life against this truck (I always thought it was a train ! Mind blown...), you can use you 5 seconds of invincibility to jump on the truck and walk on the roof of it, and it will take you to the middle of the last level directly if I remember correctly...
In
Alex Kidd, in the last castle, I remember that I found a block (?) by punching a wall (on the right of the screen), but I can't remember what was the benefit of it :F
I don't know if these few tricks are well know, but now I remember that cheats were a big part of the fun I had with videogames when I was younger...