Twilight Syndrome games in order

All 4 games of the Twilight Syndrome series in the order they came out, from Twilight Syndrome: Tansaku-hen (1996) to Twilight Syndrome: Saikai (2000).

1. Twilight Syndrome: Tansaku-henPS1
   1 Mar
2. Twilight Syndrome: InvestigationPS1
   19 Jul
3. Twilight Syndrome: SpecialPS1
   2 Jul
4. Twilight Syndrome: SaikaiPS1
   27 Jul