Mario Kart DS/Level 7

Mission 7-1

 * Description: Perform 6 power-slide turbo boosts in 1 lap!
 * Course: Rainbow Road
 * Character: Peach
 * Time: 1 minute
 * Walkthrough:

Mission 7-2
NO TIME LIMIT
 * Description: Reach the finish before Bowser!
 * Course: Bowser Castle
 * Character: Mario
 * Walkthrough:

Mission 7-3

 * Description: Complete 2 laps within the time limit!
 * Course: Tick-Tock Clock
 * Character: Donkey Kong
 * Time: 1 minute and 30 seconds
 * Walkthrough:

It's Tick-Tock Clock with an upgrade! The spinning gears and moving clock hands are faster and trickier to drive through, there are now three pendulums, which is a pain, so time it right, and a very fast shortcut. Hit the item boxes, because they contain three mushrooms. Boost across the four spinning gears with them carefully, then go through the next item box available and use the gear shortcut. It will take Donkey Kong further and faster down it, and if you want to get really creative, use a mushroom and get maximum speed! However, make sure you don't get on the wrong gear, because it will drastically slow down the kart. All the gears occasionally stop and switch directions, so look before you drive.

Mission 7-4

 * Description: Use shells to defeat all 30 Goombas within the time limit!
 * Course: Mario Circuit
 * Character: Toad
 * Time: 2 minutes
 * Walkthrough:

Get the green shells out of the item boxes, three if you have none, one if you have any, hit the Goombas before they get away, and that as simple as it gets. A good idea is to not only fire shells point-blank but out at the group. You may get lucky and hit the farther Goombas.

Mission 7-5
This mission takes accurancy. Driving carefully through the track will allow a quick pick-up of the coins. The only real challenges are getting the two coins in two additional Podboo rings. It is very easy to complete the mission, not so easy to get a three-star rank.
 * Description: Collect all 20 coins!
 * Course: Wario Stadium
 * Character: Wario
 * Time: 55 seconds
 * Walkthrough:

Mission 7-6
THIS IS THE HARDEST OF ALL THE MISSIONS!!! All eight gates are lined up in a tight circle in the order 1-6-2-7-3-8-4-5. This means it takes two go-arounds to get them. Get a turbo-boost start to reach the gates and start going through them. Do not powerslide, because this risks crashing into a gate and wasting time. Quickly weave through the gates, drifting (NOT BOOSTING OR OWERSLIDING!!!), and this will allow at least a one-star rank. A three star rank requires good timing and a very sharp turn through the gates.
 * Description: Drive through all 8 numbered gates in order!
 * Course: Nintendo DS
 * Character: Mario
 * Time: 11 seconds
 * Walkthrough:

Mission 7-7
This is not a mission to rush through. It is a maze of crates that lead to ten of the coins. Use instead of  to move and use  to go left and  to go right (as mentioned before). Do not get in a hurry driving through the crates, because it may result in breaking a useless path through or driving out of the maze. The only major concern are the two burners. Time it just right and get the last two coins.
 * Description: Drive backward and collect all 12 coins! If you hit a burner, you fail!
 * Course: Airship Fortress- Burner area
 * Character: Bowser
 * Time: 50 seconds
 * Walkthrough:

Mission 7-8

 * Description: Break all 10 item boxes while avoiding the Fake Items!
 * Course: Banshee Boardwalk
 * Character: Luigi
 * Time: 1 minute and 5 seconds
 * Walkthrough:

Boss Fight
NO TIME LIMIT
 * Description Reach the finish before Wiggler!
 * Course: Mushroom Bridge
 * Character: Mario
 * Walkthrough: