100m Freestyle (Mario & Sonic at the Olympic Games for Nintendo DS)

100m Freestyle is an Aquatics Event that appears in the Nintendo DS version of Mario & Sonic at the Olympic Games. The aim of the event is to swim the 100 metres in the fastest time, with the event taking place in the National Aquatics Center. Both the starting world and Olympic records for this event are 47.84.

Gameplay
This event starts with the characters and their lane numbers being announced, before showing the characters standing on the starting blocks. When "Ready?" appears onscreen, the player can touch and hold with the stylus to build up power, indicated by the circle around the player's character changing from blue to yellow to red, allowing them to perform a faster start. When "Go!" appears onscreen, the player must slide to the left on the Touch Screen to cause their character to dive in and start. If the player slides too early, the character will lose their balance and the player will have to wait a short while before being able to dive in. Once the player has entered the water, the player must trace the shape on the Touch Screen to swim, with the speed being determined by how fast they trace the shape. Each character as a different swimming style and stroke: Over time, the player will lose stamina, shown deleting in the heart icon, and must press or  to regain stamina. Stamina decreases faster if the player swims at a faster speed, however refilling it when the meter is particularly low will give a short speed boost after refilling. If the player does not refill the gauge in time, they will slow down and must press the button once to regain a small amount of stamina and again to fully refill the meter. At the end of the length, the player must ouch the Touch Screen when the exclamation mark symbol appears onscreen. The player will turn around anyway, but will receive a short speed boost if they touch at a the right time.
 * Vertical arrow (Front crawl): Daisy, Blaze, Mario, Luigi, Shadow, Peach
 * Horizontal arrow (Dog paddle): Sonic, Yoshi, Tails
 * Semicircle (Butterfly): Knuckles, Waluigi
 * Circle (Breaststroke): Bowser, Wario, Amy, Dr. Eggman
 * Figure eight (Crocodile style): Vector

Controls

 * Use the stylus and buttons to play this event.
 * When "READY?" appears, touch and keep in contact with the Touch Screen to build up power.
 * When "GO!" appears, slide left to dive.
 * Keep drawing the shape on the Touch Screen to swim. Swimming styles (shapes) vary by character.
 * There are 5 types of shapes: a vertical arrow, a horizontal arrow, a semicircle, a circle and a figure eight.
 * Touch the Touch Screen as your character kicks off the wall to do a quick turn!
 * When you run out of stamina (the heart icon), press the L Button (or R Button) to take a breath!
 * If you press the L Button (or R Button) when the stamina just runs out, you can recover much more!

Missions

 * Vector: Vector's first mission is to finish in second place within 50 seconds.
 * Wario: Wario's second mission is to get a three note rating five times when restoring stamina.
 * Luigi: Luigi's first mission is to place third in the event.