Mario and Sonic at the Olympic Winter Games DS [Adventure mode] playthrough [Part 1] 

Played and recorded by:
NTom64
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The Snow Spirits have been captured by Eggman and Bowser, and the world's snow has vanished without a trace.
Your mission, if you choose to accept it, is to participate in real and dream Olympic events, collect crystals to open pathways and rescue the Snow Spirits.
Sounds like a job for the cashcow mascots, then...