A Small Selection of Wii Cheats

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Change bowling ball colour

As The screen is fading to black for bowling, hold down the control pad until it fades to bowling for these colours:
Cheat Effect
Control Pad Up Blue Ball
Control Pad Right Gold Ball
Control Pad Left Red Ball
Control Pad Down Green Ball

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Wii Sports Hint - Baseball A.I. Exploit
The more skill points you accumulate, the harder it will be to beat the game A.I.

In order to get the pitcher for the A.I. to throw almost everything across the plate, you need to wear them out.

Take as many pitches as you can, working deep into each count. This trick doesn't guarentee a win, but I have yet to get negative points.

When you see the pitcher begin to sweat, an exlamation point will appear over the pitcher's head when a pitch is about to be thrown.

That means its coming right across the plate at 74 MPH. perfect home run ball if you hit the ball correctly.

Codes
Change bowling ball color

As The screen is fading to black for bowling, hold down the control pad until it fades to bowling for these colors:
Code Effect
Control Pad Up Blue Ball
Control Pad Right Gold Ball
Control Pad Down Green Ball
Control Pad Left Red Ball

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Play Golf without maps or meters

To disable the power meter, map, and the wind speed indicator, press and hold (2), then make a selection at the "Select a Course" screen.

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Change the tennis court

To change the tennis court to the blue practice court, press and hold (2) at the warning screen that shows after selecting characters.

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Silver Boxing Gloves

After you've beaten the Grand Champion, Matt, in a boxing match you'll be able to wear silver boxing gloves. To do so, hold (1) when the screen becomes black before a boxing match.
 

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Hint - 91 Strike
In the "Power Throws" training game for bowling, you might notice 2 red buttons at the end of the alley - 1 left and 1 right. When you get to the final bowl for 91 pins, you can bowl the ball along the top of the barrier on either side and hit this button. Move your Mii all the way to the left or right, and turn the aim 2 or 3 clicks towards the barrier. Let go of the ball at the highest point possible, with just a bit of spin to keep the ball on the barrier. If successful, you will hear a click, the screen
will shake and all the pins will fall down.

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Special Bowling Ball

Get to pro level to unlock a bowling ball with diamond designs on it.
Wii Sports Easter Eggs

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Scare Crowd in Bowling

To scare the crowd while bowling, start the regular motion for bowling and let go on the backswing. The ball will fly backwards and the crowd will scream and jump.
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Amuse Crowd in Bowling

To make the crowd laugh in bowling, move to either of the gutters in your lane, turn into opposite lane, and bowl so the ball goes over the barier between the lanes. The ball will go into the gutter in the opposite lane and the crowd will laugh.

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Tennis:
Tips-
Hold the WiiMote as if it were a real tennis racket.
Flick the WiiMote to hit the ball regularly - low and fast.
Hold the WiiMote like regular but start at the bottom and go upwards to make the ball go high.
When serving, press "A" to throw the ball up, and hit it when it is at its max height to make the ball go really fast, AKA serving an Ace.
When choosing the teams, put yourself on one team twice, making it two of you vs. two AIs. This makes the game easier because you don't have to rely on an AI, and also you get twice as many points for winning the game.
Codes-
Hold "2" after selecting your Mii to get an alternate court - it is one without a crowd.

Courtesy: gamespot.com/wii/sports/wiisports/hints.html | cheatscodesguides.com/wii-cheats/wii-sports/ | news.softpedia.com/news/Wii-Sports-Cheats-and-Unlockables-Wii-46781.shtml | neoseeker.com/Games/cheats/Wii/wii_sports.html