Links Crossbow Training is the pack in game with the Wii Zapper peripheral for the Wii.
The Zapper is a plastic shell resembling a submachine gun into which the Wiimote and the Nunchuck clip which costs a pretty darn reasonable £19 for the shell and the game.
Links crossbow training is a game based on the successful Zelda franchise and uses the game engine and graphics from Twilight Princess meaning the graphics are very impressive for a budget title.
Each level contains three stages falling into three categories static target shooting, defending your position for advancing enemies where you can rotate your view by moving the Wiimote to the extents of the screen and an FPS like mode where you can move Link arround with the Nunchuck stick.
Gaining points across the three stages of a level wins you medals which are required to move onto the next level.
The game mechanics are pretty simple levels are timed and you can never die (hits just reduce your score) Ammo is always unlimited, but there is a multiplier that increases on each consecutive shot so accuracy is the key to getting a good score.
Some people have complained that the game is slightly easier without using the Zapper shell, but for me this is missing the point after all a driving game might be easier with a joypad, but using a wheel is more imersive.
There are several games to be released that are compatible with the Zapper including the excellent Umbrella Chronicles and House of the Dead and for the budget price you can't really go wrong.