You are missing 3 of 223 known Atari Lynx (0.999.3 BETA) ROMS

Ghouls 'n' Ghosts Plus V.2 Demo (199x) (PD)
Puzzler 2000 (early Demo V0.2) (1998) (PD)
Puzzler 2000 (with entertainer background music) (1998) (PD)