I don't remember which were my first three games, the first time I played TG-16 was emulated in Magic Engine in the late 90s.
The first three games I played "for real" were Dungeon Explorer, Neutopia, and Keith Courage.
Sidenote: My used TG-16 was $20 from ebay in 2007, and in like-new condition. Dungeon Explorer and Neutopia were $15-20 shipped, Keith Courage $5.