The archive in /roms/GBA/2531-Summon-Night-Swordcraft-Story-2-%28U%29.rar/ appears to contain the same file as the archive in /roms/GBA/2458-Summon-Night-%28U%29.rar . The latter file also appears to actually be a zip file even though it's named .rar. Both archives extract to a file with md5sum abfa372f860d0f10037bf28cc78de409. I haven't actually tested this yet, but Summon Night (1) does contain a file with "2458" in the file name. (I guess I can't post links to the actual game pages, so sticking with relative URLs instead.)