With special Mutant Mudds Super Challenge offer.
The Nintendo 3DS version of Mutant Mudds is on sale for $4.49 (50 percent off) in the eShop. The latest version of that game includes over 20 free deluxe levels. That offer ends on March 31, 2016.
If you own the 3DS version Mutant Mudds, you'll automatically save 15 percent off the 3DS version of Mutant Mudds Super Challenge. To top that off, you'll receive a free code for the Wii U version of that title. That offer ends on April 16 at 8:59 AM PDT.
All of those offers is available for users in the United States, Canada and Mexico.
Image credit: Renegade Kid by way of Nintendo