Mario Kart DS/Level 4

Mission 4-1
You will be racing the DK Pass in reverse. Watch out for the additional snowmen scattered throughout this course and pick up item blocks along the way for mushrooms and invincibility.
 * Description: Reach the finish before Donkey Kong!
 * Course: DK Pass
 * Character: Wario
 * NO TIME LIMIT

Mission 4-2
Power boosting may cause you to avoid the items in the middle. Instead, wait for the timer to tick down and grab the first item. Use the map to locate crabs and blast them within the time limit.
 * Description: Blast 20 Crabs!
 * Course: Palm Shore
 * Character: Yoshi
 * Time: 2 minutes

Mission 4-3
The red car will get a head start of you. Be sure to power boost through every turn and grab the item blocks when they appear. Be careful when passing the red car as it will change lanes often.
 * Description: Reach the finish before the red car!
 * Course: Shroom Ridge
 * Character: Mario
 * NO TIME LIMIT

Mission 4-4
The first gate is in plain site when the match starts. Go through it and grab the triple mushrooms from the item blocks. Use two of the mushrooms to go behind the pyramid for gate #2. You should be lined up for gate three so use the third mushroom to boost through it. Gate #4 is straight through on the track; however, stay towards the left side of the path afterwards (grabbing the item block) as you're going to have to make a sharp turn towards the right for gate #5. Once past gate #5, boost through gate #6 over the sand hills for a shortcut to gate #7.
 * Description: Drive through all 7 numbered gates in order!
 * Course: Desert Hills
 * Character: Wario
 * Time: 45 seconds

Mission 4-5
Power boost from the start to get the first half of the coins. Quickly make a U-Turn and grab the rest of the coins by waiting for the Thwomps to drop before immediately racing towards them, just as with the first half. They will have lifted by the time you reach them (from the back wall) and you can just drive straight through.
 * Description: Collect all 15 coins. If you get squished by a Thwomp, you fail!
 * Course: GBA Bowser Castle 2
 * Character: Bowser
 * Time: 30 seconds

Mission 4-6
Use the map to quickly determine the bogus blocks from the real one. Memorizing which ones are the correct ones will make it easier to get a star rank. The table below describes which blocks you want to hit.
 * Description: Break all 10 item boxes while avoiding the Fake Items!
 * Course: N64 Choco Mountain
 * Character: Donkey Kong
 * Time: 1 minute and 10 seconds

Set 1: Second to the left

Set 2: Center

Set 3: Second to the left

Set 4: Right

Set 5: Left

Set 6: Right

Set 7: Second to the left

Set 8: Right

Set 9: Second to the right

Set 10: Center

Mission 4-7
Go through the first two gates and then make a figure 8 lap to pick up the rest
 * Description: Drive through all 10 Gates!
 * Course: Waluigi Pinball
 * Character: Toad
 * Time: 45 seconds

Mission 4-8
There are plenty of opportunities to power-slide through this twisty course. Be sure to power-slide at every opportunity.
 * Description: Perform 9 power-slide turbo boosts in 1 lap!
 * Course: GBA Luigi Circuit
 * Character: Luigi
 * Time: 1 minute

Boss Stage
Use your power-slide to grab circles of coins. When Boo shuts off the lights, quickly find him and ram into him. A good strategy, however, is to reset King Boo at the cost of a balloon, so that you might not have to chase him at all. A three-star ranking is still possible with this strategy.
 * Description: Collect 50 Coins while avoiding King Boo!
 * Course: Lava Arena (name based on surroundings)
 * Character: Peach
 * Time: 5 minutes