This is a fun game which could even do well as a stand-alone game but it is better that it comes with the Wii Zapper. You play as Link from The Legend of Zelda series and you have to shoot targets and enemies with your zappers in a shooting game that controls well with your Zapper. I think the best part of it all is when you do levels in which you can move Link around, making it more of a shooter game than a typical light gun rail shooting game. Link even has a charge shot from his crossbow; it's better than your ordinary light gun shooting games because of this movement and that charge shot.
You get points by shooting targets (even more if you get a bullseye) or enemies; this stacks for each consecutive target you hit (x1 for 1 enemy, x2 for 2 enemies, x3 for 3 enemies etc.). The zoom is a nice feature that will help you out as well. Lastly, you can get an automatic crossbow that temporarily lets you rapidly fire arrows at enemies.