Fortnite - Wildcat Bundle requires Fortnite base game installed.
Fortnite WildCat Bundle includes:
WildCat Fortnite outfit with two additional styles;
Sleek Strike Back Bling with additional two styles;
2,000 V-Bucks.
Instruction how to activate your Fortnite Wildcat bundle key on eshop:
Select the Nintendo eShop icon on the Home Menu;
Log in or choose the account you want to use;
Scroll down below and press the Enter Code button;
Enter the purchased key code and click OK;
Press Redeem Download Code to finish.