I want to play Wonderboy, what is the best order to play this series?

There's only one proper Wonderboy game (and a spin-off series based off it, Adventure Island). If you want a sidescrolling action-RPG, play Monster Land, Dragon's Trap, Monster World III, and Monster World IV, in that order. Monster Lair is a shmup/platformer hybrid. Best ones imo are Dragon's Trap and Monster World 4.

>>3707510
As with anything, production order.
You don't neccesarily have to beat them though. Play 'em for a bit until you find one that you think you're up to seeing through to the end. Wonder Boy 3: The Dragons Trap and Wonder Boy in Monster World are highlights. Wonder Boy in Monster Land (not World!) is probably the most difficult one.

>>3707510
wonder boy arcade, wonderboy in monsterland arcade, monsterworld IV MD, forget the rest

File: Wonder-Boy-in-Monster-World (WB-III).png (22KB, 679x530px) Image search: [Google]

22KB, 679x530px

>>3708934
>forgetting Monster World III

NO WAY!