Table 1.

Coding process.

Theme	Subtheme	Coding	Original interview samples (partial)
SOFS	Familiarity with the image	Exquisite picture	The details are very well done because I have been to the Mogao Grottoes, and it has captured many details that I didn't observe closely in Cave 220, which are incredibly realistic, as if they were in the real world
		Delicate animation effects	The visuals are incredibly realistic; when an empty magazine falls to the ground, it can roll to other places, just like how ordinary objects roll around everywhere when they drop
	Familiarity with the sound	Familiar background music	When I enter a very dark place, isn't there always some scary background music, just like when I watch a horror movie, it makes me feel afraid in an instant
		Familiar object sound	When firing at a glass bottle, I can hear the sound of the bottle shattering, just like the sound of us breaking glass on the ground
SOFI	Familiarity with responds from others	Familiar optional control	When I write with a calligraphy brush, it goes so smoothly and turns out so well, but it doesn't have the feeling from my childhood of worrying that a single stroke with the brush might make the lines too thick
		Familiar respond from enemy	After I shot the monster in the head, its reaction was very realistic
	Familiarity with reaction from avatar itself	Familiar Self-Motion	When I approach an obstacle, it prevents me from moving forward, just as I cannot walk through obstacles in a real environment
		Familiar avatar reaction	When I see a zombie, I instinctively retreat, and at this moment the game voices my inner monolog, such as “Damn it, don't come any closer”