Based on this site, it looks like there are just 15 games.

Game Availability Notes
The Binding of Isaac: Rebirth eShop only
BlockForm
BRICK RACE
Dragon Fang Z: Ryuusha Rose to Yadorigi no Meikyuu eShop only A 2019 New 3DS port of the 2017 Switch game.
Fire Emblem Warriors
Futuridum EP Deluxe
Lifespeed eShop only
Minecraft: New Nintendo 3DS Edition Both
Pinball Hall of Fame: Williams Collection
Pirate Pop Plus
Pixel Hunter
Runbow Pocket
Silver Falls: 3 Down Stars eShop only
Wind-Up Knight 2
Xenoblade Chronicles 3D Both

I only ask, because that console is selling used where I live for about 200-300, but the 3dsxl is only about 100 if you find a good deal usually around 120.