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Fantasy Zone Gear: Opa Opa Jr. no Bouken (ファンタジーゾーンGear オパオパJr.の冒険), released outside of Japan as just Fantasy Zone is a Game Gear shoot 'em up game that is part of the Fantasy Zone series. Despite having the same name as the Master System game in western regions, Fantasy Zone Gear is in fact a completely different game which makes use of the Game Gear's extended color palette.
In the space year 6216, Opa-Opa had defeated the Menon forces and restored peace to the Fantasy Zone. Peace has reigned in the Fantasy Zone for the next century, and it is now the year 6344. However, rumours of impending trouble have begun to arise in the Fantasy Zone, and just as the rumours have reached Opa-Opa Jr., the son of the legendary hero Opa-Opa, his friends start disappearing one at a time until his father also disappears.
One day, Opa-Opa Jr. receives a letter that reads "Fantasy Zone will be converted into Fantasy Zone Gear according to our plans. Your father is our captive. He will be of no help to you if you try to resist us. You have one week to decide what to do. We suggest that you surrender." Not willing to surrender, Opa-Opa Jr. sets out to defeat the Menon forces and save his father and friends.
Fantasy Zone Gear offers very little to the table, other than new stages and music (though many of the jingles are identical to that of the original Fantasy Zone). Due to size restraints, it is unable to show any kind of HUD in game, however Opa-Opa Jr.'s equipment can be changed at any time by hitting the START button.
Unlike previous games, levels in Fantasy Zone Gear were given generic titles by Sega of America. They are all very similar, the only major difference each time being the choice of enemies.
Wood's boss is a large, tree-like creature with a spring. It simply extends its nose to try and defeat Opa-Opa Jr. (the nose also doubling up as the weak point). After it attacks, it will spring up into the air and try and land on top of the player.
Fire's boss is an odd creature which moves in a circular motion, stopping every now and then to fire a missile in one of four directions. These missiles then explode into eight chunks which spread across the screen. Everything is a weak point. Thanks to the Game Gear's small resolution it's very easy to accidentally collide with this boss, so it's a good idea to upgrade in advance.
Ice's boss is simple in comparison to the previous boss battle. Parts of a face will slowly track Opa-Opa Jr.'s position and the player simply needs to destroy the eyebrows, eyes, nose and mouth; then they'll be able to attack the head itself in a similar manner, provided, again, they've upgraded your speed.
The only static boss in the whole game, Water's boss simply fires four green orbs in the player's general direction, which will slowly hunt them down until they destroy them. Alternatively, water will fall from the top of the screen which will need avoiding, though if the player can keep at least one orb on screen this will never occur. Its head is its weak point.
The extremely large boss of Cloud is a blimp-like creature which follows Opa-Opa Jr. around the room. It occasionally stops to fire forwards and launch several floating bombs which litter the screen. Like many bosses in this game, the difficulty comes from the cramped conditions the player is forced to fight in. Unlike previous bosses, this one seems to take a lot longer to kill.
Desert's boss is a large totem-pole creature, in which sections of the boss fly hoizontally across the screen to try and hit Opa-Opa Jr..
The final level, like all Fantasy Zone games, simply puts Opa-Opa Jr. against all of the bosses he's encountered so far, before having him face the end boss. As Fantasy Zone Gear drops the backgrounds when bosses are encountered, this level has no identity of its own. The player never "sees" where Opa-Opa Jr. actually is, only that he's got bosses to fight.