Fantasy Zone II

Similar to Defender, the player occupies a side-scrolling level that repeats indefinitely, and in which the player can freely travel left or right. Each zone contains several "bases" that serve as primary targets. New to the sequel are "warps" hidden behind certain bases that allow the player to travel between different zones. Each level has at least three zones, and when all of the bases have been cleared in all of the zones of a level, the player can travel through the warp to the boss.

Boss fights do not allow for free travel as the main stages do, and force the player to face the boss or face a particular direction. Bosses are generally very large and change color to reflect damage taken. The final stage is a "boss rush" in which the player must fight a succession of previous bosses before fighting the final boss.

In the past, the courageous hero Opa-Opa saved the Fantasy Zone from the invading Menon forces, but his victory came at a price as he was forced to fight his own father who led the invasion. It is now Space Year 1432, 10 years after that battle, and the Nenon forces are spreading chaos through the Fantasy Zone. Opa-Opa must once again fly into the Fantasy Zone to rout the invasion.

At the end of the game, Opa-Opa comes face-to-face with the invasion's mastermind: an identical copy of himself. After a tense battle, Opa-Opa's father appears to confront them, and the sight of him brings Opa-Opa to tears which causes the second Opa-Opa to vanish. It is later revealed that this twin is a physical manifestation of Opa-Opa's dark impulses and desires, spawned from a war that took place during his childhood, and seeking to drive the Fantasy Zone into ruin. Reunited with his father, Opa-Opa is able to purge this darkness from himself and swears that such a disaster will never occur again.

The Master System port received positive reviews. Computer and Video Games scored it 88% in 1990. Console XS scored it 90% score in 1992.