Dick Tracy for Game Boy is a sequel to the NES game of the same name. It features a new case for Tracy, when Big Boy breaks out of prison and plots his revenge.
From Wikipedia: "Popeye 2 (ポパイ2?) is a 1991 2D platform game, developed by Copya System and published by Sigma Enterprises for the Game Boy handheld. It was later published in North America (1993) and Europe (1994) by Activision. It is a sequel to Popeye, released exclusively in Japan in 1990."
Teenage Mutant Ninja Turtles II: Back from the Sewers, released as Teenage Mutant Hero Turtles II: Back from the Sewers in Europe, and simply Teenage Mutant Ninja Turtles 2 in Japan, is a 1991 Game Boy game by Konami. It is the sequel to Teenage Mutant Ninja Turtles: Fall of the Foot Clan.
Battletoads for the Game Boy (not to be confused with Battletoads in Ragnarok's World, which is a port of the NES game) is the second game in the Battletoads series.
In Brain Bender, mirrors are manipulated in order to get them to reflect a laser beam into some balls of gas and destroy the satellite. Brain Bender features 120 different puzzles to solve.
Wizardry Gaiden I: Suffering of the Queen published in 1991 by ASCII, was the first of the trilogy of Wizardry roleplaying games released for the original gray-scale Nintendo Gameboy portable video game system.
School's out and Bart's ready for some summer fun in the sun! Until he got the news - Homer and Marge were sending him and Lisa off to summer camp. Not just any camp, but the infamous Camp Deadly! How bad could it be? Well, with Ironfist Burns as head counselor and Nelson and his band of bullies as bunkmates, it's not exactly paradise. Bart and Lisa are determined to get out - but first they've got to survive outrageous food fights, killer bees and a life-threatening game of capture the flag. Help Bart and Lisa escape, at least in time for school!
The "Xerd" of the game's title is a hero who defeated evil 800 years in the past. You control another character (default name Jake), prince of the one of the kingdoms, to defeat his evil twin brother by hunting down the reincarnation of the legendary hero.
There used to be a continent called "Mu Continent", which was ruled by the king of the country called Prina. King Lars II suddenly turned the state religion of Neil into the evil religion of Max. Shortly after the Neil people were ousted from the sanctuary, the Queen of Purina suddenly disappeared. In addition, the newborn son of the king was taken away by someone. After the conversion, monsters began to appear in various parts of the continent. People began rumors that the people of Neil were manipulating monsters. It's been 16 years since then. The demons, who continued to grow in power, finally invaded Purina Castle. The seriously injured king runs to the remote village "Eribe".
Chachamaru Boukenki 3: Abyss no Tou is a Role-Playing game, published by Human Entertainment, which was released exclusively in Japan in 1991.
Interestingly, the main character was modeled after a developer at Human that later would appear as referee in a Fire Pro Wrestling for Super Famicom.
The player is an astronaut trapped on an alien spaceship who has to try to find his way out while avoiding aliens and continually replenishing his oxygen supply. This was the first isometric view game on the Game Boy