Did you buy your 3DS when it was full price? Did you visit the eShop before the end of August? Did you download your 10 free NES games?
Here's a piece featuring the 10 NES games that were made available:
Super Mario Bros. The Legend of Zelda Zelda II: The Adventure of Link Metroid Donkey Kong Jr. Balloon Fight Ice Climber Wrecking Crew NES Open Tournament Golf Yoshi
nice drawing man! the colors especially, you captured that older vintage feel btw are these still available? i don't have a 3DS yet but plan to get one, even if they aren't free I'd still get em