PS2 screen resolution varies from 256 x 224 to 1280 x 1024. Everything 320 x 240 or below is low res. You'll notice a scanlined, unfiltered picture in real low res.
Disgaea
Megaman X collection
NeoGeo compilations, at least some of them.
Tekken 1,2 arcade modes in Tekken V
WWE Smackdown Shut Your Mouth
GRADIUS III AND IV FUKKATSU NO SHINWA
LA PUCELLE HIKARI NO SEIJO DENSETSU
MAKAI SENKI DISGAEA
DO DONPACHI DAI-OU-JOU (tate only)
THE KING OF FIGHTERS 2000
PHANTOM BRAVE
ICO
SHADOW OF MEMORIES
MARL DE JIGSAW
XII STAG (tate only)
Games with low-res designed graphics but hi-res display (fake low-res from now on):
TALES OF DESTINY 2 (partially)
METAL SLUG 3
THE KING OF FIGHTERS 2001
SNK VS. CAPCOM SVC CHAOS
HYPER STREET FIGHTER II
NAMCO MUSEUM
Info needed:
TENSHI NO PRESENT MARL OUKOKU MONOGATARI
SEVEN MALLMORSE NO KIHEITAI (true hi-res graphics?)
GEKISHA BOY 2 TOKUDANE TAIKOKU NIPPON (3D game?)
GROW LANSER II
GENERATION OF CHAOS
GROW LANSER III
GENERATION OF CHAOS NEXT
GENERATION OF CHAOS III
BOMBER MAN LAND 2 (2D game?)
CARDINAL ARC
GROW LANSER IV
http://www.the-nextlevel.com/tnl/threads/27158-PS2-2D-games-with-true-low-resolution-display
