You need to have the 2 necessary games (Minecraft, terraria) also try TBOI and shovel knight. If you're looking for exclusives try out MKP7 (may be misspelled, it's a modded online version of mario kart 7), Mario brothers 2, and lots more. Also try out the default apps like Mii.

Rayman Legends Kirby and the Rainbow Curse Need For Speed Most Wanted U Kirby Mass Attack (DS) I have other examples but if I write too much Juxt crash.

Oh and also Mario Kart Generation is a cool mod!