This week's list of Nintendo's digital offerings is topped with a playable demo of Mario & Sonic at the London 2012 Olympic Games.
That should give you all the help you need in deciding whether or not to splash the cash. Elsewhere, there's a new physics puzzle game on WiiWare, and Mutant Mudds, a cool-looking platform adventure for 3DS, is on the eShop.
Mutant Mudds - Armed with a heavy-duty water cannon, Max must vanquish his nemeses, the Mutant Mudds, by blasting and hovering his way across the soiled landscape to seek out mysterious Water Sprites. (For Nintendo 3DS)
Mario & Sonic at the London 2012 Olympic Games (demo version) - Join Mario and Sonic in the world's greatest sporting competition. With more than 50 playable events, the Olympic Games have never been so much fun. This demo is now available on Nintendo eShop. (For Nintendo 3DS)
Newton vs. The Horde - Scientists are being attacked by a horde of vicious monsters. Use physics to squash, skewer and explode those nasty creatures and do whatever you can to help our scientist friends survive. (Wii)
Also new this week:
Lola's Alphabet Train (Nintendo eShop / Nintendo DSiWare)
Flipper 2: Flush the Goldfish (Nintendo eShop / Nintendo DSiWare)
Trailers and screens are through the source link.