Phantom Blade Zero: how three portals unlock the red house
Finding the entrance early is not enough: its key requires progress in later regions.

If you found the red house near the base of the 杀气 tower but the door is locked, the next step is not a nearby switch. PC Gamer says the door needs the Puppet’s Tongue, obtained through later quest steps.
Spoiler warning: the following steps mention later areas and quest items.
In the questline PC Gamer calls The Herald’s Illusion, the first portal is beside the Puppet Testing Grounds bell in 陆家村, at the end of the area after descending the well. The second is after the Mandate Encampment boss, reached with the key obtained in 庞镇. For the third, repair the illusory pipa and remove the barrier northeast of Meigu Lake; the portal follows the Mountain of Imprisonment boss.
Each portal opens one eye on the suspended puppet. After the third, speak to it to receive the tongue and return to the house. The English names follow the source and have not been independently verified as UI terminology.
The source does not state its tested platform or version. Patch 1.0302256 does not identify this route; we have not tested it after the update.
