Spike Chunsoft started today in the Japan PSN the official Halloween Sale 2016 where you can buy selected PlayStation (PSP, PS3, PS4, Vita) games with up to 80% OFF.
On the list you can find popular titles like Terraria, Hotline Miami Collected Edition, Mighty No.9 the first CONCEPTION and CONCEPTION II, Danganronpa 1&2 Reload and more.

The sale period going to be held until October 31, 2016. You can find the exactly list with the selected games and the prices in here: http://www.spike-chunsoft.co.jp/event/detail/61