Fish-A-Waja
Fish-A-Waja is a very simple daily game which is free to play and can only be played once per day. It can be found in the games menu by clicking World, then Games. This game is designed to be like a common fair/carnival game called fishing for ducks, in which several rubber duckies are set up in a small pool and fair goers are allowed to pick one and receive a prize based on what's written on the bottom of the duck.
Fish-A-Waja works in essentially the same way, except with plastic wajas instead of ducks. The game's page features a picture of several clickable plastic wajas floating in a pool. To play you simply click the plastic waja of your choice and you will receive WC as a prize. The exact amount of WC you win is chosen at random, though it is generally between 50,000 WC and 75,000 WC.
As a bonus, whenever you play Fish-A-Waja there is a small chance that you will recieve a Plastic Waja in addition to your WC prize.