The Bugs Bunny Crazy Castle 4

The Bugs Bunny Crazy Castle 4 (バックス・バニー クレイジーキャッスル4) is a platform game developed by Kemco as part of the Crazy Castle series. While previous installments in the series were available on the Game Boy, this is the first game to be released for the Game Boy Color.

Gameplay
As in Bugs Bunny: Crazy Castle 3, the game is divided into a number of level series, this time a total of over 100 levels across 13 areas. Bugs first navigates various outer environments of the Taz Island: a forest, underground caves, a hollow tree, a mountain range, a stream, and a tropical area. He then explores the rooms of the castle: the grounds, the courtyard, the ice room, the machine room, towers, and halls, before confronting the Tasmanian Devil, the game's final boss and apparently the castle's ruler, in the throne room. Some areas feature gimmicks like mushrooms Bugs can bounce off of in the forest and teleporters in the machine room. To advance through each level, he must collect eight keys while avoiding or fighting back against a large cast of Looney Tunes characters. Besides Taz, these include Beaky Buzzard, Daffy Duck, Elmer Fudd, Elvis the ape, Foghorn Leghorn, Fox Pop, Gossamer, Little Ghost, Marc Antony, O'Pat the leprechaun, Pepe Le Pew, Wile E. Coyote, and Yosemite Sam. Helpful items, including weapons to eliminate enemies, can be stored in the inventory. Some enemies wander back and forth in the same area, with Elmer and Sam able to shoot projectiles, while others freely roam around the levels. Taz himself can not only roam around the map but also spit multiple projectiles and quickly catch up to Bugs when he is far away by spinning through the air in a vortex. A password system is used to load saved games. Upon completing the final level, Bugs rescues Lola Bunny.

Story
While cleaning out his rabbit hole, Bugs Bunny finds a map leading to a location marked "C Castle", although he does not know what the C stands for, as the letters after the initial "C" have worn away. He immediately assumes the C stands for "Carrot" and eagerly embarks on a journey to discover the castle in the center of the Taz Island, unaware that the C actually stands for "Crazy"