How do I say immersive in Japanese?
I want to say immersive but not in the VR sense but more in the sense of, an immersive experience, like in the sense of a good game that gets you really immersed.

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Answer

I am not sure if I got the meaning of "immersive / immersed" right and answered your question correctly.
Please let me know if these are not the answers you are looking for.
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1. be addicted to / be into (something / someone)

「~に夢中（むちゅう）になる」
「~にハマる」

「ゲーム に 夢中 に なる」（ゲーム に むちゅう に なる）
"Be addicted to the/a game."

「ゲーム に ハマる」（ゲーム に ハマる）--- a casual expression
"Be into the/a game"

「（人 を）夢中 に させる ゲーム」（(ひと を) むちゅう に させる ゲーム）
"Addicting game(s)"

2. realistic feeling (VR kind of immersive experience)

「臨場感」（りんじょうかん）

「臨場感 が ある ゲーム」（りんじょうかん が ある ゲーム）
"game with realistic feeling"

「臨場感 が 味わえる ゲーム」（りんじょうかん が あじわえる ゲーム）
"game that gives the immersive experience"

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