Gooseka the Slippery (グースカ) is the third henchman of Janken the Great in Alex Kidd in Miracle World. He is a secondary antagonist who must be defeated in Janken matches in order to progress. Gooseka appears in two locations: just prior to Alex reaching Lake Fathom, and at the Radaxian Castle.
In Alex Kidd in Miracle World, Gooseka is faced twice. Firstly at the end of the first motorbike stage in a simple game of Janken. Defeating him at the game twice reduces him to a Rice Ball/Hamburger which Alex must consume to complete the stage. However, losing the game twice, as with all Janken matches to follow, causes Alex to turn to stone and lose a life.
Gooseka's second appearance occurs in the Radaxian Castle. Again the game is Janken, but this time Gooseka doesn't go down so easily after his defeat. Instead, his head detaches and attacks Alex. Three punches to the face are required to defeat him.