Best Master System Game?

Great Idea ! To speak about this fantastic machine, the Master System !
A lot of Marvelous games ! The best of all is (what a surprise !) PHANTASY STAR !!

But there is a lot of marvelous games so this is hard to make a choice but the best games have been already chosen by other members !
YS is my first action RPG, juste before playing PS on this MS ! Which is a true RPG
Wonder Boy III ! What a wonderful game
Shinobi Of course !
And I'd like to put another game that is highly unknown but which have been quoted by some of the members here : Lord of the Sword ! I've played it a lot with my two brothers but I've never finished it (but I've looked at the videos of someone playing through it and finishing it ! ) Try it if you can :! This game is great

Yeah, it is a shame that Ys II was never brought over for the Master System- you really can't have those apart.